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Do different chargers matter?

There are a couple of threads here about different chargers. Some people claim different charging rates, some claim different resulting battery life, and some claims are outright outrageous from an engineering perspective.
So I did a test.
Short Answer: No unless using the computer
Charging from the wall is faster than charging from a computer. But the big NO comes in the form of people claiming improvements from chargers other than the official Samsung one.
Long answer:
So I proceeded to build a test rig and check various chargers in various conditions. The conditions tested were: Phone flat (10% charge), Phone nearly full (80% charge) and Phone Full. In all cases tests were done with the screen showing white, and all wireless on, and the screen showing black and in airplane mode to see what impact it had on different chargers.
The chargers which were tested:
700mA Samsung charger that came with the phone
Computer USB power
500mA generic wall USB charger with Chinese written all over it
800mA Car USB charger
1A iPhone wall USB charger
1A HTC wall USB charger (not sure which phone it comes with)
added a 30A bench supply just to be sure, only 80% test done.
Before I continue I should say that the screen off and screen on as well as airplane mode would have an impact on battery charging rate providing the charging current is constant. I.e. You draw 500mA from the wall when the screen is off and the screen is on, there's a difference which is only likely to be going into the battery.
The method was to build a little pass through device that gave me access to all the USB lines. I broke the 5V line and passed it through 2 multi-meters one measuring current through the line and the other measuring voltage.
Results:
Phone at 10%
0.7A Samsung -> 475mA
Computer -> 83-87mA (no voltage sag)
0.5A Generic -> 345-380mA (Note voltage sagging at 3.8V indicates that the device is underpowered)
0.8A Car -> 478mA
1A iPhone -> 470mA
1A HTC -> 476mA​
Phone at 80%
0.7A Samsung -> 472mA
Computer -> 84-90mA
0.5A Generic (test not repeated due to power concerns)
0.8A Car -> 471mA
1A iPhone -> 475mA
1A HTC -> 471mA
30A Bench -> 470mA​
Phone at fully charged
0.7A Samsung -> 12mA
Computer -> 11-14mA (noisy voltage line)
0.5A -> 12mA
0.8A Car -> 12mA
1A iPhone -> 12mA
1A HTC -> 12mA​
Variances with screen and cell networks:
No changes were observed on any charger between switching the screen off and displaying white as well as switching airplane mode off and on. Until that is the battery was fully charged.
The phone idles at 12mA on airplane mode with the screen off.
With the wireless and cell on the phone jumps between 10mA and 40mA every 2-10 seconds for about 3 seconds. It looks like it is polling the wireless.
With the screen on displaying white full brightness the phone jumps between 130mA and 170mA.
This is interesting as it would suggest that if the cell and wireless are on and the screen is set to maximum brightness you'll likely be draining your battery even through it's on charge if you're plugged into the computer.​
Discussion of results:
If your charger is underpowered expect problems. I wouldn't use a cheap Chinese USB -> wall adapter with the phone. But if your charger is capable of supplying at least 700mA then there is absolutely no difference going beyond that.
The computer only drawing less than 100mA is consistent with the windows driver interface saying that the phone has only requested 100mA from the USB slot. This is a driver issue as the USB2.0 spec should be able to provide 500mA from a USB port providing it is the only device on the hub drawing power.
The claim that you get more battery life out of a different charger is absurd. There were theories floating around about "topping up" batteries requiring a lot of power. Actually it's exactly the opposite. As batteries top up the power demands decrease a LOT. Above about 95% there was a noticeable slow decline in current draw. Eventually even before the battery full notice came on the phone was drawing less than 160mA from the wall, and about 10 seconds after saying battery is full it dropped down to the levels mentioned above.
There are a lot of things that can cause variances in battery life, but using a different charger is not one because you are not using a different charger just providing power from a different source. The charger is a small chip on the board of the SGS made by Maxim. If you provide the phone with 5V and >500mA it will happily draw the 500mA. The only exception being the computer power supply.

Thanks for the time you took for testing this, will soak all this text & do my testing based on your method to see if it does make any noticeable difference or not.

thanks for the info. its very usefull.. I appreciated it..

garbz said:
The computer only drawing less than 100mA is consistent with the windows driver interface saying that the phone has only requested 100mA from the USB slot. This is a driver issue as the USB2.0 spec should be able to provide 500mA from a USB port providing it is the only device on the hub drawing power.
Click to expand...
Click to collapse
So are you saying that a driver upgrade would allow my phone to charge just as quickly from the computer as from the Samsung charger that came with the phone? Presumably, using Linux would also solve this?
I'm actually interested in the heat generated by charging. I recently installed some navigation software and used it for the first time on Thursday. Obviously the screen was on constantly as was GPS. Because I only had around 25% charge when I began my journey, I was charging it continually from the moment I left the house. The sun was shining on the windscreen and very quickly the combination of the sun, continual charging and the draw on the battery from the display etc caused the battery temperature to climb to around 63 degrees C. A status message popped up and told me that charging had ceased because the temperature had become too high.
It's a very clever feature that the software recognises that the temperature has become too high and ceases charging but I'm looking to stop this from happening. I tried turning off wifi etc but this didn't make much difference.
Unfortunately, the cigarette lighter -> USB charger I have doesn't tell me how many mA it's providing. I just wondered whether using a car charger with a lower (or perhaps even higher) mA rating might cause less overheat? Otherwise I'm afraid my phone mightn't be usable as a navigation device.

Wierd, as my Logitech charger (don't know the amperage, around 1-2A I got fot the Performance MX) seems to be charging the phone quite faster than the included flimsy Samsung. (Up to the 90% mark, where it tapers off to trickle charging.)

Dude, that's awesome. You saved me some money with that... I was planning on buying another charger to see if it'll be better.
Good job, and thanks for doing that!

TormodMacleod said:
So are you saying that a driver upgrade would allow my phone to charge just as quickly from the computer as from the Samsung charger that came with the phone? Presumably, using Linux would also solve this?
I'm actually interested in the heat generated by charging.
...
It's a very clever feature that the software recognises that the temperature has become too high and ceases charging but I'm looking to stop this from happening. I tried turning off wifi etc but this didn't make much difference.
...
I just wondered whether using a car charger with a lower (or perhaps even higher) mA rating might cause less overheat? Otherwise I'm afraid my phone mightn't be usable as a navigation device.
Click to expand...
Click to collapse
I wouldn't worry about the heat. As you said yourself it has an internal cut-off. These cut-offs work before the device is damaged not after. High heat may reduce long term life but it's generally not an issue.
Much of the heat actually comes from the power conversion circuit at the top when charging and when the screen is on and not from the battery. While overseas I used my phone for about a month straight as a Mobile AP while on charge, now THAT generates a heck of a lot of heat and I had no ill effect after a month of daily usage for about 6 hours like this, so you should be fine.
Do NOT use an under powered car charger. At best you'll blow a fuse in it, at worst you can cause it to burn. Overloading a charger is not an effective way of limiting current. Not to mention that when overloading the voltage drops which may cause unexpected effects in the phone.
As for the USB thing, no Linux won't help. This isn't a windows issue it's a USB issue. USB2.0 ports provide 100mA of power UNLESS a device specific driver requests more power from the system. It would be a combination of a custom driver for the PC, and probably a change in the phone depending on how the phone's power circuit works (i.e. does the phone tell the power circuit it's plugged into the PC and limit the current?)
Sinotek said:
Dude, that's awesome. You saved me some money with that... I was planning on buying another charger to see if it'll be better.
Good job, and thanks for doing that!
Click to expand...
Click to collapse
You're welcome.
This was more for my own benefit really. Everything I know about electronics would lead to the conclusion of clever trickery, a potential fire hazard when using low power chargers, or that people weren't seeing right. It was driving me nuts not knowing.

I had Theo Same doubys. Thanks for testing. Appreciatie Theo effort made
Sent from my GT-I9000 using XDA App

there ARE differences between chargers.
for example:
with sgs stock charger [700mA] when i download from internet [HSDPA 7.2 Mb] and set brightness to maximum it is discharging instead of charging. the result is even worse with lower charger.
i am using 1200 mA charger from a Nokia N900 and it is doing the job very well.
some say that powerfull chargers shortens the battery life, but i do not care about that.

The data nor the theory back that up.
Suppose the phone did draw a variable current, what's to stop the resulting fire hazard of overloading the charger?
If I knew someone with an N900 I'd be happy to try it for you but given the results so far... actually I do have one more thing I can test.

Flashlight on to keep screen at 100% brightness, downloading JVP, and powered by a 30A !!! powersupply.
End result is it still uses 470mA.
There is nothing to back up the idea that different powerpacks make any difference, and plenty of logical theory as to why it would be a very bloody bad idea to blindly just start drawing power.
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garbz said:
Flashlight on to keep screen at 100% brightness, downloading JVP, and powered by a 30A !!! powersupply.
End result is it still uses 470mA.
There is nothing to back up the idea that different powerpacks make any difference, and plenty of logical theory as to why it would be a very bloody bad idea to blindly just start drawing power.
Click to expand...
Click to collapse
ah, the old computer PSU-> lab power supply trick. Favorite of EE students everywhere

Extraordinary work, garbz.

Nice Job.
So I'll look for a 1A charger in order to get it full short and dirty ;-)

thanks for this my friend kept on telling me that I need a more ''powerful" charger than the one that came with my vibrant :/

Sorry to bump an old topic but thought it worth doing as this is a very good thread to answer the question about chargers. I have a Note which comes with a 1A charger but the lead is short, I need to use an adapter to fit the plug in (as it's EU and I'm in the UK) plus the charger makes a slight high frequency buzzing noise. My N900 charger which is 1200mA works fine (and has a longer lead, is silent and doesn't need an adapter) and I assumed the device would draw the current it needs but was then concerned by some people claiming that would damage the battery, this thread shows that is not the case.
John

There's an explanation here of why different chargers do indeed make a difference:
http://en.wikipedia.org/wiki/Usb#Power
see in particular the note on the Battery Charger Spec.
In particular. my own testing shows I can go from 500ma to 700mA charging current simply by changing a small connector in line between the 7Ahr battery I'm using to charge the phone, and the phone. That's due to the nature of the short on the data pins.
There are proprietary tweaks to this mechanism; e.g. iPhones use voltage signalling between the two data lines and ground to indicate various things to the device.
All of this is only for "hosts", i.e. chargers etc, that don't implement the USB protocol and so can't engage in the normal current negotation that occurs when connecting e.g. the device to a PC.

Yeah they to I was at my uncles place and I pluged the micro-USB for sgs and charged it. I tried moving the lockscreen but the touchscreen wasn't working
Sent from my GT-I9000 using XDA App

THank you for the Review!

thanks for all the info!

Tronsmart 54W 5-Port Desktop Charger (QC2.0) Review

Tronsmart reached out to me a week back and asked me if I would like to review one of their new products and share my opinion with them. I liked the fact that they didn’t specifically ask me to write good things about the product or highlight only its pros, which many companies do when they offer you a free review product. I decided to do a detailed review of this product and give my honest opinion.
Two days later, I received this Qualcomm Quick Charge 2.0 Certified Tronsmart 54W 5-Port desktop charger (I know! That sounds great). It’s been 4 days since I’m constantly using this with my 5 different devices that need USB charging. Two of my cellphones (S6 Edge+ & Nexus 4), a ZenWatch, a BlueBuds X and a BlueSYNC Bluetooth Speaker (another review product).
Before I start with the review, let’s look at the product page here and see what really does this product claim to do ?
Here’s the list of features mentioned on their website:-
1. Qualcomm Quick Charge 2.0 technology in one of the ports (distinguished by blue color)
2. VoltIQ – Smart Circuit to identify the power level required for charging each connected device
3. Backward Compatibility – Charge older smartphones which didn’t have high amp charging adapters
4. 54 Watts max output through 5-ports (not each)
5. Ultra Compact
6. Safety Guarantee – No Overcharging, No Overheating and Over Current protection
7. 18-Months worry free warranty
List of items received in the package:-
- The desktop charger
- A Power Cord
- 6 Feet USB Cable
- A Cable tie
- User Manual
Since we have set the base, let’s start the review..
It came in a nice and sleek cardboard package (probably recyclable), the content didn’t seem like shaking at all. The whole package was sealed with a plastic wrapper (which kind of makes the idea of recyclable box dumb). A paper seal would have made more sense here.
Here’s an overlook of the box (I’ve taken out the plastic wrapper already):-
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Moving on, here are the contents of the box:-
Let’s be frank here. Nobody would actually trust their $900 brand new phone with a third party charger even if it’s a brand like Tronsmart. So, before I connecting this to my Galaxy S6 Edge+ and to make this review really worthwhile, I used this USB Current/Voltage Tester to check the power output of the product and compare it with my original charger. Usually less volt/amp wouldn’t harm your device but a higher power output may have an adverse effect if the device is unable to handle such high power. Even though I was pretty sure a product from brand like Tronsmart wouldn’t do such a thing, but better be safe than sorry… This tester is connected as an interface between the device (S6 Edge+) and the charger and displays power drawn by the connected device.
I connected the tester with my Edge+ and the genuine Samsung Adaptive Fast Charging Adapter. [Adaptive Fast Charging is almost equivalent to Quick Charge 2.0, only major difference being, Adaptive Fast Charging supports 5V and 9V adapters while the Quick Charge also supports 12V along with 5V and 9V. So, there’s the reason for my worry]. So, when connected to the genuine Samsung adapter, S6Edge+ was drawing 1.59Amp at 9.13V.
Next, I connected the tester between the Tronsmart Quick Charge port (Blue colored) and S6Edge+ and Edge+ was drawing 1.62 Amp at 9.00 V. Being a third party adapter, I didn’t really expect such accurate results. I know there is a marginal difference in voltage, but this kind of difference doesn’t matter at all.
Here's the image comparison:-
Galaxy S6 Edge+ can distinguish between a fast charger and a regular charger, so when I connected the Edge+ to a Tronsmart regular port, this is how Samsung tells you that its not utilizing the fast charging:-
Since I’m assured now that my S6 Edge+ is perfectly safe and compatible with this Tronsmart Desktop Charger, I wanted to move on to older devices which draws 1 Amp equivalent current and see if the charger’s VoltIQ detects and delivers the right amount of power. So, I connected my Nexus 4 to an Asus 1 Amp charger and recorded the readings as below: 0.87 Amp at 5.17V.
With Tronsmart Charger connected to the nexus 4, it was pretty amazing to see the following result:-
I didn’t stop there. Ofcourse my trust level has increased significantly on this charger, however, I wanted to go further with devices which draws extremely low current like my Asus ZenWatch and Jaybird BlueBuds X. And again, I was pretty amazed with the results because these devices, specifically my BlueBud X, draws extremely low current, like 0.01A (connected to laptop) and VoltIQ was able to detect just the right amount of Volt and Current for my device. Here’s the result from the test on my ZenWatch, BlueBud X and BlueSYNC Speakers respectively:-
I also verified that the readings are consistent even when all 5 devices are connected simultaneously.
Once I was totally satisfied with the output range it gives, I also wanted to verify the time it takes (the blue port) to charge my S6 Edge+ from 3% to 100%, so I ran a separate test. And again, result isn’t very different from what an actual Samsung Adaptive Fast charger claims to do. Here is the breakup of the charging time of S6 Edge+ from 3% to 100% :-
By now I should have, but I didn’t stop here either. I connected 5 devices to all 5 ports and have been doing the same for last 4 days to test if the charger heats up and trust me, it doesn’t even a bit. It’s been performing well and it stays cool. And it cleaned up the mess I had with 5 different charges connected to an extension.
Overall, I’m extremely pleased with this charger’s performance and the build quality definitely looks nice with good finishing. It doesn’t look like cheap plastic item at all. And I’m sure there’s no point in telling this since nobody would probably carry this in their daily bags, but this thing is really small. Look at the image below comparing it with credit card sized gift card.
Finally, here’s my pros and cons list for this item:-
Pros:
1. Fast Charging with Qualcomm Quick Charge 2.0 Certification and compatibility with Samsung Adaptive Fast Charging
2. Smart enough to detect all my device power limits - VoltIQ (this is what makes it useful)
3. High Power output even in regular ports (helps charging high end smartphone devices faster which doesn’t support Qualcomm QC2.0 or Adaptive Fast Charging)
4. No heat
5. Very Compact
6. 18 Months Warranty (should be enough for the money you pay for this one)
Cons:-
1. No LED to show charger is turned ON (personal preference)
2. Only 1 USB Cable inside box
3. Power Cord could have been longer
I know the cons section isn’t really applicable to everyone; it’s just my personal preference. However, if anybody asks me, I would definitely suggest this product in a heartbeat. It’s very cheap too. I know there are more such brands like Anker or Aukey, but I haven’t reviewed them, I reviewed this one and I’m totally satisfied.
Here’s a video review I created earlier:-
https://www.youtube.com/watch?v=DR8W9ozZgAs
*Please note that the readings of the first day (when I made the video) and the day when I wrote the review aren't going to match accurately due to reasons like % of charging. However, the values are approximately same and the difference can easily ignored.

Will consider this for my next purchase. Thanks for the detailed review :good:

Choetech Qi Wireless Charger under $20 - Review

I've been looking out for a Wireless Charger since the Samsung Charging Pad gave up on my S6 Edge+ on the first day itself. I did get it replaced, however, the second one didn't work either. I know there are some good wireless chargers out there, but frankly, the ones I liked were quite pricey. Its just that, I didn't want to spend more than $20 on something I might never use and not to mention, I just spent like $900 on my new phone.
I came across this CHOETECH Circle Wireless Charger which looked really good. Having seen the reviews of other CHOETECH products, I expected a descent quality out of the brand and the price tag looked just perfect for what I was looking for. So, without further thinking, I just ordered one. I've been using it for a week now and I don't have any regrets at all.
Like most of the product brands, CHOETECH also reached out to me asking about my experience with the product and if I'm willing to write a review on it. Hell yeah, I'm always ready for a review and since I'm writing one, why not on XDA. So here's how it goes:-
I have set a standard for reviewing any product on following categories:-
1. Packaging & Content
2. Build Quality & Design
3. Functionality
4. Pros & Cons
I'll go through each of them one by one.
Packaging & Content
From a user's perspective, this might not be the best category for reviewing, however, a consumer's first impression comes with the packaging of the product. It is definitely one of the reasons for so many unboxing videos that we see on YouTube. Now, the one about this product which didn't really impress me is its packaging. It comes in a sleek soft box as shown below:-
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As you can see, the box doesn't really give an impression of a top notch brand as it doesn't even mention the exact name of the product which is CHOE Circle Qi Wireless Charger [highlighted above]. It also lacks any kind of seal [highlighted above] or mentioning some of the unique features of this product that I read online while ordering. May be I'm expecting too much of a $20 product, but that's just me. This may not even bother most of you.
Looking through the contents of the box, we have the following items:-
- Wireless Charging Pad
- USB Cable
- Instruction Manual
- Service Manual
So, you did notice that we don't have a charging adapter coming up with this one. May be that's why the charger is priced at just $20. I don't really care for this (since I've plenty of spare chargers) but, for some, it might be a deal breaker because if they want to use it at their office and the original fast charger at home, they might have to buy a spare charger (with atleast 2 Amp output).
Moving on to the next category...
Build Quality & Design
With an Alumnium back, this product is definitely one of the best out there at this price range. Not just the top, the bottom also has a thick rubber ring to hold onto its ground, no matter where you place it. It has the perfect grip to keep the smartphone in place even without a case on S6 Edge+ and Note 5, which are extremely slippery due to their glass back. The top surface is shiny plastic to provide wireless charging capability. Although it is slightly smaller than Samsung Wireless Charger, the size is just right for any smartphone or smartwatch (Moto 360).
Overall, it might not give you the best premium feel that you would get with brands like Samsung or Google (Nexus), but it is definitely made out of a good quality material and gives feeling of a quality product.
Functionality
Where the Samsung Wireless Charging pad failed to charge my S6 Edge+, this one didn't dissapoint me at all. Just like the former, the CHOETECH Wireless Charger is QI based and it also has an illuminating Blue LED around it which starts glowing once the phone has been placed over it and the charging starts. The blue LED also notifies you when it is unable to charge wirelessly when you place a phone (without wireless charging capability) on top of it. I love the blue illumination since it tells me that my phone is charging alright, but with the Samsung Pad, it used to bother me at night with the illumination being too bright. Thanks to CHOETECH's Smart Light Sensor, this charger dims or completely turns off the bright blue LED depending on the nearby ambient light. That means, if I turn off the light at night, the blue LED around it turns off automatically, but the charging continues.
Another feature that I noticed on this is, even if the phone reaches 100% battery, the charger doesn't turn off (like Samsung's did) and when you get up in the morning, you get your device with 100% Charge. This might be a good thing for some, because I've seen people complaining over it on Samsung Wireless Pad's review that it turns off automatically and the phone charge goes down by the time they get up in the morning. Anyway, this is definitely a matter of personal choice, and I would have preferred an auto-off system against this one.
The charger specification mentions input as 5V/2A, so any modern day charging adapter would do just fine with this wireless pad. The output mentioned is 5V/1A which is same as any other wireless charger available in the market. With this specification, a 3000 mAh battery should charge within 3 hours. So, does it really stand upto it's bold claim? Let's find out...
So, I used a USB power meter to see how much current is drawn when a Nexus 4 and S6 Edge+ is charging. Its hard to tell if the shown current is being drawn by the wireless charger for itself or is it the rate at which, the phone is charging. If I have to take a guess, I would say it's the current that the charger is drawing for itself in order to generate the wireless charging through it's induction coil. Here's a comparison between the Nexus 4 and Edge:-
I also noted down the S6 Edge+ charge time at specific intervals while charging it from 6% - 100%. You can see a constant charging rate from 6%-80% in the graph. And then it takes a little more time from that point to 100%
From the readings above, one can tell that the average time from 0%-100% would be around 3 hours for a 3000 mAh battery (S6 Edge+), which is exactly the time a charger would require if it's output is 1 Amp. And this is where I felt I've made the right choice. A 3 hour charge time for wireless charging is definitely a good sign and I'm 100% satisified with this product. I also ran some tests using different cases for my Edge+ (2 SPG and 1 Arozel) and it didn't make any difference at all. The charger was able to charge my phone through all the cases, which again is a good sign as I read in many of the Wireless Pad's reviews that they don't charge when a case is used.
Pros & Cons
Here's a list of pros and cons for Choetech QI Wireless Charger :-
Pros
- Solid Build Quality
- Small in Size
- Top & Bottom Grips
- Good Power output
- Smart Light Sensor
- No Beep Sound on charge completion
Cons
- Poor Boxing (No Seal on Box either)
- No Charging Adapter
- Doesn't turn-off after 100% charging
So, overall, I'm extremely satisfied with this product. If you're looking for a cheap wireless charger that looks good and gets the job done, this one is definitely for you. However, if your budget isn't limited, you can always opt for a wireless charger from brands like Samsung or Google (Nexus).
Here's a quick video review of the same: CHOE TECH Circle Qi Wireless Charger - Quick Review

The best review i've even seen, good job!

I was going to order this wireless charger but didn't because I don't know if it will charge my phone thru the case. I have the i-blason here http://www.amazon.com/gp/aw/d/B013D...+plus+case&dpPl=1&dpID=519HbBaRRuL&ref=plSrch. Wonder if it will work I know the Samsung one will not charge my phone with this case on my phone.

richierich118 said:
I was going to order this wireless charger but didn't because I don't know if it will charge my phone thru the case. I have the i-blason here http://www.amazon.com/gp/aw/d/B013D...+plus+case&dpPl=1&dpID=519HbBaRRuL&ref=plSrch. Wonder if it will work I know the Samsung one will not charge my phone with this case on my phone.
Click to expand...
Click to collapse
It looks really thick, i doubt it could be charged wirelessly with case on.

richierich118 said:
I was going to order this wireless charger but didn't because I don't know if it will charge my phone thru the case. I have the i-blason here http://www.amazon.com/gp/aw/d/B013D...+plus+case&dpPl=1&dpID=519HbBaRRuL&ref=plSrch. Wonder if it will work I know the Samsung one will not charge my phone with this case on my phone.
Click to expand...
Click to collapse
I've tried it with only a couple of cases I had and it worked fine with each of them. But since you're mentioning that even the Samsung's Charger didn't work with your case, even I would doubt it now. Best would be to just order one and see for yourself. You can always return if it doesn't work for you..

Is not a really thick case about 3/4 thinner then a otter box case with the same protection. Funny is how I have the same style case on my s5 and it will charge with the same wireless charger thru the case.

richierich118 said:
Is not a really thick case about 3/4 thinner then a otter box case with the same protection. Funny is how I have the same style case on my s5 and it will charge with the same wireless charger thru the case.
Click to expand...
Click to collapse
Have you tried it with case on Samsung's new fast charge wireless charger?

I don't think the Samsung Fast Charger is out yet.. Its still on ore-order status on Samsung official website and B&H
Sent from my SAMSUNG-SM-G928A using XDA Free mobile app

apurva.giri said:
I don't think the Samsung Fast Charger is out yet.. Its still on ore-order status on Samsung official website and B&H
Sent from my SAMSUNG-SM-G928A using XDA Free mobile app
Click to expand...
Click to collapse
It's already listed on Amazon, here is the link:
http://www.amazon.com/Samsung-Fast-Charge-Wireless-Charging/dp/B012AWBN9C/
And i heard fast wireless charger is in package when you buy Note 5 or S6 Edge+ in UK.

feihu989 said:
It's already listed on Amazon, here is the link:
http://www.amazon.com/Samsung-Fast-Charge-Wireless-Charging/dp/B012AWBN9C/
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Click to collapse
Thanks for the info... :good:
feihu989 said:
And i heard fast wireless charger is in package when you buy Note 5 or S6 Edge+ in UK.
Click to expand...
Click to collapse
I heard that too... Too bad for us US Customers! Even the one, that some of the stores offered free, isn't working with Edge+.

nice find. i hate that the charger i got with mine doesn't even work. i know it isnt the charger itself because my s6 will charge fine on it. what screen protector do you have op?

sand1303 said:
nice find. i hate that the charger i got with mine doesn't even work. i know it isnt the charger itself because my s6 will charge fine on it. what screen protector do you have op?
Click to expand...
Click to collapse
I use Zagg. But I would suggest buying ArmorSuit or Skinomi. Zagg is just too costly! See another thread I hv started where ArmorSuit is available for $0.45. Nothing can go wrong with that price tag. Not sure though if the offer is still available though!

Here are some tests I read of both the Choetech Circle and the Samsung wireless charging pad from Talkandroid. All tests were done during a timed 30 minutes of charging with a few days in between and after various restarts of the Galaxy S6 Edge.
Choetech
30% -> 41% (with case) (11% increase)
30% -> 43% (with case) (13% increase)
75% -> 91% (without case) (16% increase)
05% -> 23% (without case) (18% increase)
Samsung
24% -> 43% (with case) (19% increase)
74% -> 90% (with case) (16% increase)
08% -> 21% (without case) (13% increase)
11% -> 31% (without case) (20% increase)

st8chic said:
Here are some tests I read of both the Choetech Circle and the Samsung wireless charging pad from Talkandroid. All tests were done during a timed 30 minutes of charging with a few days in between and after various restarts of the Galaxy S6 Edge.
Choetech
30% -> 41% (with case) (11% increase)
30% -> 43% (with case) (13% increase)
75% -> 91% (without case) (16% increase)
05% -> 23% (without case) (18% increase)
Samsung
24% -> 43% (with case) (19% increase)
74% -> 90% (with case) (16% increase)
08% -> 21% (without case) (13% increase)
11% -> 31% (without case) (20% increase)
Click to expand...
Click to collapse
Charging result won't be consistent ever unless we do it from top to bottom.. (0-100) and see the final time. Every device charges at its own different rate depending on various factors. Besides, the battery meter would never be precise. That goes for my review too.
But one thing is certain from your tests. A case do affect the charge time with a wireless charger. Thanks for sharing the result!

apurva.giri said:
Charging result won't be consistent ever unless we do it from top to bottom.. (0-100) and see the final time. Every device charges at its own different rate depending on various factors. Besides, the battery meter would never be precise. That goes for my review too.
But one thing is certain from your tests. A case do affect the charge time with a wireless charger. Thanks for sharing the result!
Click to expand...
Click to collapse
Fast charge wireless charger will charge your phone much quicker than normal wireless charger, 10w output is almost as fast as wired charging, full charge in 2 hours.

feihu989 said:
Fast charge wireless charger will charge your phone much quicker than normal wireless charger, 10w output is almost as fast as wired charging.
Click to expand...
Click to collapse
I know that. But st8chic was talking about the usual Samsung Wireless Charging pad, not the fast one!

is this fast charge or does it charge at 2.1 amp?

No. This is not Fast Charger.
Sent from my SAMSUNG-SM-G928A using XDA Free mobile app

apurva.giri said:
I've been looking out for a Wireless Charger since the Samsung Charging Pad gave up on my S6 Edge+ on the first day itself. I did get it replaced, however, the second one didn't work either. I know there are some good wireless chargers out there, but frankly, the ones I liked were quite pricey. Its just that, I didn't want to spend more than $20 on something I might never use and not to mention, I just spent like $900 on my new phone.
I came across this CHOETECH Circle Wireless Charger which looked really good. Having seen the reviews of other CHOETECH products, I expected a descent quality out of the brand and the price tag looked just perfect for what I was looking for. So, without further thinking, I just ordered one. I've been using it for a week now and I don't have any regrets at all.
Like most of the product brands, CHOETECH also reached out to me asking about my experience with the product and if I'm willing to write a review on it. Hell yeah, I'm always ready for a review and since I'm writing one, why not on XDA. So here's how it goes:-
I have set a standard for reviewing any product on following categories:-
1. Packaging & Content
2. Build Quality & Design
3. Functionality
4. Pros & Cons
I'll go through each of them one by one.
Packaging & Content
From a user's perspective, this might not be the best category for reviewing, however, a consumer's first impression comes with the packaging of the product. It is definitely one of the reasons for so many unboxing videos that we see on YouTube. Now, the one about this product which didn't really impress me is its packaging. It comes in a sleek soft box as shown below:-
As you can see, the box doesn't really give an impression of a top notch brand as it doesn't even mention the exact name of the product which is CHOE Circle Qi Wireless Charger [highlighted above]. It also lacks any kind of seal [highlighted above] or mentioning some of the unique features of this product that I read online while ordering. May be I'm expecting too much of a $20 product, but that's just me. This may not even bother most of you.
Looking through the contents of the box, we have the following items:-
- Wireless Charging Pad
- USB Cable
- Instruction Manual
- Service Manual
So, you did notice that we don't have a charging adapter coming up with this one. May be that's why the charger is priced at just $20. I don't really care for this (since I've plenty of spare chargers) but, for some, it might be a deal breaker because if they want to use it at their office and the original fast charger at home, they might have to buy a spare charger (with atleast 2 Amp output).
Moving on to the next category...
Build Quality & Design
With an Alumnium back, this product is definitely one of the best out there at this price range. Not just the top, the bottom also has a thick rubber ring to hold onto its ground, no matter where you place it. It has the perfect grip to keep the smartphone in place even without a case on S6 Edge+ and Note 5, which are extremely slippery due to their glass back. The top surface is shiny plastic to provide wireless charging capability. Although it is slightly smaller than Samsung Wireless Charger, the size is just right for any smartphone or smartwatch (Moto 360).
Overall, it might not give you the best premium feel that you would get with brands like Samsung or Google (Nexus), but it is definitely made out of a good quality material and gives feeling of a quality product.
Functionality
Where the Samsung Wireless Charging pad failed to charge my S6 Edge+, this one didn't dissapoint me at all. Just like the former, the CHOETECH Wireless Charger is QI based and it also has an illuminating Blue LED around it which starts glowing once the phone has been placed over it and the charging starts. The blue LED also notifies you when it is unable to charge wirelessly when you place a phone (without wireless charging capability) on top of it. I love the blue illumination since it tells me that my phone is charging alright, but with the Samsung Pad, it used to bother me at night with the illumination being too bright. Thanks to CHOETECH's Smart Light Sensor, this charger dims or completely turns off the bright blue LED depending on the nearby ambient light. That means, if I turn off the light at night, the blue LED around it turns off automatically, but the charging continues.
Another feature that I noticed on this is, even if the phone reaches 100% battery, the charger doesn't turn off (like Samsung's did) and when you get up in the morning, you get your device with 100% Charge. This might be a good thing for some, because I've seen people complaining over it on Samsung Wireless Pad's review that it turns off automatically and the phone charge goes down by the time they get up in the morning. Anyway, this is definitely a matter of personal choice, and I would have preferred an auto-off system against this one.
The charger specification mentions input as 5V/2A, so any modern day charging adapter would do just fine with this wireless pad. The output mentioned is 5V/1A which is same as any other wireless charger available in the market. With this specification, a 3000 mAh battery should charge within 3 hours. So, does it really stand upto it's bold claim? Let's find out...
So, I used a USB power meter to see how much current is drawn when a Nexus 4 and S6 Edge+ is charging. Its hard to tell if the shown current is being drawn by the wireless charger for itself or is it the rate at which, the phone is charging. If I have to take a guess, I would say it's the current that the charger is drawing for itself in order to generate the wireless charging through it's induction coil. Here's a comparison between the Nexus 4 and Edge:-
I also noted down the S6 Edge+ charge time at specific intervals while charging it from 6% - 100%. You can see a constant charging rate from 6%-80% in the graph. And then it takes a little more time from that point to 100%
From the readings above, one can tell that the average time from 0%-100% would be around 3 hours for a 3000 mAh battery (S6 Edge+), which is exactly the time a charger would require if it's output is 1 Amp. And this is where I felt I've made the right choice. A 3 hour charge time for wireless charging is definitely a good sign and I'm 100% satisified with this product. I also ran some tests using different cases for my Edge+ (2 SPG and 1 Arozel) and it didn't make any difference at all. The charger was able to charge my phone through all the cases, which again is a good sign as I read in many of the Wireless Pad's reviews that they don't charge when a case is used.
Pros & Cons
Here's a list of pros and cons for Choetech QI Wireless Charger :-
Pros
- Solid Build Quality
- Small in Size
- Top & Bottom Grips
- Good Power output
- Smart Light Sensor
- No Beep Sound on charge completion
Cons
- Poor Boxing (No Seal on Box either)
- No Charging Adapter
- Doesn't turn-off after 100% charging
So, overall, I'm extremely satisfied with this product. If you're looking for a cheap wireless charger that looks good and gets the job done, this one is definitely for you. However, if your budget isn't limited, you can always opt for a wireless charger from brands like Samsung or Google (Nexus).
Here's a quick video review of the same: CHOE TECH Circle Qi Wireless Charger - Quick Review
Click to expand...
Click to collapse
I ordered this product few days back. I really like some of its features which include micro USB port, Smart Light Sensor and rubber grip on the bottom. This product is one of the best at this price range. It would be better if they have added charger adapter. I am happy with this product and its one of the best in same price range.

The T-Mobile variant came with the Fast Charging adapter. Haven't used it yet, was gonna get a car charger/spare charger so i can carry it in my bag.

Tronsmart dual USB 36W Rapid Charger (QC2.0) Review

After a 54W Desktop Charger a few weeks back, this is my second review unit from Tronsmart. It's been 6 days since I'm using this product and I'm definitely inclined towards writing another great review on their product.
Before I start with the review, here's the product listing on Amazon
Like most of my reviews, I'll split this up in following categories:-
1. Packaging & Content
2. Build Quality & Design
3. Functionality
4. Pros & Cons
I'll go through each of them, one at a time.
Packaging & Content
The Tronsmart Rapid Car charger came well packed in a colorful display box with every detail written all over it. Unlike last time, this box isn't one of those recyclable brown boxes but this one do give an impression of a renowned brand too. And there's seal on the box (It's kind of important to me).
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Following are the in-box items you get:-
- Tronsmart Rapid Charger ( 2 x USB Output )
- 2 x USB Cables (premium quality)
- User Manual
- VoltIQ Info Card
Even if it makes sense to give 2 USB cables since the Rapid Charger has 2 USB Outputs, honestly, I didn't expect that. And both the cables are premium built and long enough to use confortably even while charging (unless you have cigerette lighter port located somewhere far away from the dashboard). Infact, as per Tronsmart, the USB cables are custom made standardized 20AWG cables (thick cable for less voltage drop and strength) specifically designed for Quick Charge 2.0 Ports.
Moving on to the next category...
Build Quality & Design
I'm very picky when it comes to design & build and let me say this outloud, so far, Tronsmart hasn't dissapointed me at all. The rapid charger's quality feels top notch and I couldn't find any flaw in the finishing of the product either. With it's matte black surface, green colored USB Ports and engraved brand name, the charger looks absolutely gorgious. Look at the images and decide for yourselves:-
Overall, this is a beautiful charger which is small (for a 2-Port charger), very light and yet feels very sturdy in hand.
Functionality
Inspite of it's small size, this rapid charger packs 2 USB Outputs with both having Qualcomm Quick Charge 2.0 Certification. In other words, it's a tiny powerhouse which can charge 2 of your power hungry USB devices rapidly and simultanously. The specification on Amazon listing claims that this charger can charge 2 QC2 devices simultanously at 9V/2A (max) and for non QC devices 5V/2.4A (max). With that said, one must know that a phone incapable of handling such high power (mostly old phones) might be adversely affected due to high current/voltage flow. And that's where VoltIQ comes into play.
The VoltIQ
The voltIQ is a smart circuit that controls the flow of current and voltage by identifying the connected device and it's maximum supported power input. For example, a 3 years old Nexus 4 doesn't support rapid charging and it could draw only upto 5V/1.25A (avg) max power. Even, the genuine adapter that came with it had rated output of 5V/1.2A. So what happens if I connect it to Tronsmart Rapid Car Charger ? No, it certainly doesn't damage the battery of nexus 4 thanks to VoltIQ which detects that the device can draw only upto 5V/1.2A and delivers the same power for efficient charging. Similarly, when a rapid charging capable device is connected, the charger delivers an optimum fast charging output to charge that device at a much faster rate.
To validate the claims made by VoltIQ, I tested the review unit with an iPhone 6 Plus, S6 Edge+, ZenWatch and Bluebux X. Following are the results of the OEM charger output and Tronsmart Rapid Car Charger:-
Although I'm more than satisfied with the performance of this tiny charger, there's one thing that I'm not fully convinced about. The Amazon description of the product says this adapter would deliver upto 5V/2.4A for Apple products, however, my iPhone could only draw 5.12V/1.15A which is significantly lesser than the power advertised. But then again, the description could have been for an iPad since I know the iPad comes with a higher power rated adapter compared to an iPhone. I'm just going to ignore this because my iPhone is charging faster than it's original adapter(Yes, iPhone 6 Plus supports fast charging via iPad's adapter).
Update [9/19/2015]: Just heard back from Tronsmart. Here's what they said on charging Apple products:-
Because VoltIQ technology will automatically detect the demanding current for the devices needed. For the iPhone 6 with empty battery capacity, Tronsmart charger will offer the largest currect 1.5A, for iPhone 6 Plus, the largest current offered is 1.8A, and for iPad, the largest current is 2.4A. So in the description it says this adapter would deliver upto 5V/2.4A for Apple products.
When I was charging the iPhone 6 Plus, the current drawn initially was 1.25A (at 90% battery charged) and finally settled for 1.15A (at 93% charged) few minutes later. So the explanation do make sense. As I suspected earlier, only the iPad utilizes the full potential of this charger but either way, the iPhone 6 Plus charges way faster than it's original adapter and it's battery is definitely not affected since it supports fast charging (high current input) - source
Overall, if you're looking for an affordable car charger, this is the way to go. And if 2 ports aren't enough to juice up all of your devices while you travel, you can look into several other Tronsmart Accessories which offer upto 4 USB Outputs on a Car Charger.

Still looking for a external battery that either has QC 2.0 on more than one port, or on one port with all others charging at up to at least 2.1A

mohinipollob said:
Still looking for a external battery that either has QC 2.0 on more than one port, or on one port with all others charging at up to at least 2.1A
Click to expand...
Click to collapse
Here's one if that's what you're looking for : Aukey Quick Charge 2.0 10400mAh Portable External Battery

mohinipollob said:
Still looking for a external battery that either has QC 2.0 on more than one port, or on one port with all others charging at up to at least 2.1A
Click to expand...
Click to collapse
I doubt you could find such a external battery, 1 QC 2.0 port(18w) + 2.1A port(11) = 29W output, it would generate too much heat with a case on.

feihu989 said:
I doubt you could find such a external battery, 1 QC 2.0 port(18w) + 2.1A port(11) = 29W output, it would generate too much heat with a case on.
Click to expand...
Click to collapse
Yeah, Right! Pardon me, I didn't read the complete comment. Just posted a url for QC 2.0 powerbank!
Sent from my SAMSUNG-SM-G928A using XDA Free mobile app

Ordered me one of these and then I came across this review... Nice.

[Review]iVoler USB Type C Power Bank 10000 mAh (5V @ 3A IN/OUT) Pix

Hello,
I got a free sample of this device from <MODERATOR EDITED - SPAM LINK REMOVED> for an honest and unbiased review.
Since I didn´t have any Power Bank for my devices, I was excited to try this one out
<MODERATOR EDITED - SPAM LINK REMOVED>
This Power Bank is quite small and easy to carry around. It provides enough juice to help you out through longer journeys
The build quality is nice, I didn´t see any sharp edges. The text markings are easy to read too. I don´t care too much about the looks of this device but I think that it doesn´t look cheap at all. In fact I really like the overall design.
What I really like about this Power Bank is the USB Type C Output which can provide a charging current of 3A @ 5V, like a regular USB Type C charger.
Features:
Optimized Charging/Discharging Efficiency: Up to 85% conversion rate for Type-C and up to 88% for USB.
TRUE TYPE-C FAST 3A INPUT & OUTPUT: The first ever external battery charger with USB-C/Type-C. Use it to quickly recharge the external battery, or to power the latest computers and smartphones and smart wearable devices with USB-C/Type-C ports.
DUAL USB PORT: One USB Type C Port that supports up to 5V 3A. Also included one USB-A Port with smart auto detect technology which charges up to 5V 2.4A maximum for other non Type C devices.
RAPID RECHARGE: Even with a huge 10000mAh battery, It only takes 3.5 hours with a compatible 5v 3A Type C Charger.
TYPE C Compatible devices: Google Nexus 6P/ 5X, Apple New Macbook (2015) 12 inches, Microsoft Lumia 950/950 XL, OnePlus 2, Google Chromebook Pixel.
WHAT YOU GET: iVoler TYPE C Power Bank, One USB-A to USB-C Charging Cable (with 56K ohm resistor which is compatible with any old USB Charger), One USB-C to C Charging Cable.
Pictures:
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Tests:
I used the App Ampere for the tests in order to have a good guess, if this Power Bank can actually deliver what it promises.
I was able to charge my Nexus 6P with a current of about 3000mA (=3A) which is what you would expect from a regular Type C charger too.
It seems that this device can deliver what <MODERATOR EDITED - SPAM LINK REMOVED> mentions in the descriptions.
I also tried this Power Bank with my old Nexus 5 (2013) and a Fenix UC30 LED Flashlight and everything worked out fine.
My Power Bank uses blue LEDs instead of green LEDs.
I´m happy with this Power Bank. It is small enough to fit in every pocket and still has enough juice for my needs. It is able to replace a USB Type C charger in terms of charging speed which is awesome.
I will need a few more tests in order to check the efficiency but for now it seems that the values of 85% for USB Type C and 88% for USB seem to be realistic.
You should be able to fully charge a Nexus 6P about 2x with one full Power Bank. You can charge this Power Bank very fast too by using your USB Type C charger
Did you make similar experiences too ?

1. Update : No problems so far with the charging of devices. The power bank doesn't heat up while charging my devices.

2. Update: Still no problems with charging the phones. I will have a total % of Nexus 6P charges soon

Ok guys, I think I can present the test results
If you fully charge this Power Bank and ONLY use it to check the capacity from time to time ( short press on the power button, long press to shut this power bank off again ) and charge a Nexus 6P only, you can get about 190% of charge until this device will shut off and discharge completely. This value can be slightly higher or lower, depending on how much you fiddle around but let´s assume that 190% should be something everybody could obtain for now. Let´s ignore some measure errors and tolerances since this approximation should be realistic enough.
190% of Nexus 6P Battery = 6555mAh of usable capacity which is a very good value for this power bank.
It seems that the efficiency of this power bank is quite high if we look at it from this perspective.
Assuming that this device uses Battery Cells with these values: 10000mAh * 3,7V = 37Wh ---> 37Wh / 5V = 7,4Ah --> 7400mAh capacity which could be used in theory if we had a efficiency of 100% ( which ofc is not possible since these Battery Cells also feed the charging circuit which also has some losses too. ).
Now let´s have a look at the 190% of the Nexus 6P charge again: 1,9 * 3450mAh = 6555 mAh of usable capacity until the power bank is fully discharged and shuts off.
6555 mAh / 7400 mAh = 0,8859 --> 88,6% efficiency.
It seems that the USB Type C output is very good but you have to consider that my tests might not be 100% precise but good enough to check if this power bank really works the way it should. I think that it´s worth the spending and iVoler didn´t promise too much
In conclusion: This Power Bank can charge a Nexus 6P nearly 2x which is a good value. It is small enough to fit in every pocket and doesn´t weigh a lot which makes it a great companion

The only thing keeping me from buying this is the aesthetics... It's not that good looking imho. I have an anker astro e4 2nd gen and it charges the 6P really slowly, but the only anker alternative is a massive 20100mah battery
Inviato dal mio Nexus 6P utilizzando Tapatalk

Well, the looks of some gadgets might be important too but I´m not the guy who cares too much about them The looks of this Power Bank are ok in my eyes, not too fancy but also nothing I would consider as "ugly" or "cheap looking".
One thing to consider is that the capacity mentioned by the manufacturers is only the capacity of the built in Battery Cells; not the 100% capacity you will use for charging devices only since the charging circuit also needs some of the juice in order to work
Let´s assume that a cheap and random Power Bank might claim to have a capacity of 34500 mAh. One customer might think that this capacity divided through the capacity of the built in phone battery might equal the amount of charges ? In this case you could charge a Nexus 6P about 10x ?
Not this time The cells used have a voltage of 3,7V most the time.
One short approximation might be to have a look at the power first: 34500mA * 3,7V = 127,65W
This is the power you could achieve from the used Battery Cells. Now we need to consider that we don´t use a voltage of 3,7V for the USB ports but 5V instead which requires a circuit to transform the 3,7V up to 5V ( most the time through a step up converter circuit ).
127,65W / 5V = 25,53A which could be translated into 25530mAh if we can transform the power from the Battery Cells without any losses ( 100% efficiency which is impossible ).
Now let´s assume that one cheap and random Power Bank might work at a efficiency of 75%: 0,75 * 25530mAh = 19147,5mAh
Roughly you would get a usable capacity of 19147,5mAh: 19147,5mAh / 3450mAh = 5,55x
That´s the tricky part with most power banks. And I admit that it´s rather tough to find a smaller Power Bank which is not too big and still fits in a pocket while also being able to use a modern USB Type C output. Other Power Banks have a greater capacity but also cost more and are not very small.
I guess that not everybody is willing to carry a large Power Bank in his pants...if he even manages to fit such a brick inside These huge Power Banks are great for longer journeys though if you carry them in a backpack anyway.