I got my Qi pad yesterday in; this one specifically:
http://www.ebay.nl/itm/380712337929
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But the phone gets extremely hot after a short time. When charging by wire it's a little higher than the environment temperature: 22-25C = 71-77F (depends on trickle charge or duration charge of course), but when charging it over the Qi Pad the battery goes up to 42C=107F (and it went hotter the night before, but didn't check the temps back then).
I also notice it really jumps in terms of magnetic field. Now it's a minute I receive about 60 microTeslas of magnetic field, then it's a minute with 200 microTeslas.
Is this a normal for Qi charging? or is there something wrong and rather shouldn't use the pad?
how do you detect how strong your magnetic field is?
convolution said:
how do you detect how strong your magnetic field is?
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https://play.google.com/store/apps/details?id=com.eclipsim.gpsstatus2
Great toolbox honestly, tried a few, foumd this one to be so good I bought the pro version to support the dev. Temps might be a pro-only feature though, not sure.
And lol you already knew the app as you put it in your copied GPS fix guide.
The temperature range you provided is typical of induction charging. My N4 tends to be in the 100-110F range while charging wirelessly. Some heat is generated/energy is lost when transferring energy via induction.
The phone will communicate with the charger to draw the right amount of current depending on the battery state.
wx27 said:
The temperature range you provided is typical of induction charging. My N4 tends to be in the 100-110F range while charging wirelessly. Some heat is generated/energy is lost when transferring energy via induction.
The phone will communicate with the charger to draw the right amount of current depending on the battery state.
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Alright, then I know there is nothing wrong with the pad. It's a cheap chinese one after all.
even with the nexus charging orb, my nexus4 gets hot when using it. i think it's normal for the head to dissipate across the phone and the charger
That's a weird looking foot.
Sent from my Nexus 4 using Tapatalk
i use my gf's samsung qi charger and its the same. i dont know the exact temperature but i usually have to let it sit off charger for a a few seconds before picking it up as the back is extremely hot to touch.
alright, then I know it's normal, but I doubt it's healthy for the battery lifespan :/. Batteries usually degrade a lot when exposed to heat.
Related
GSI Super Quality Desktop 3-In-1 Rapid Charger/Cradle/Data-Sync Docking Station For Sprint Samsung Epic 4G Cell Phone - Plus Slot For Extra Battery Charge - Powered By USB Or By Included AC Wall Adapter
http://www.amazon.com/GSI-Quality-D...sr_1_1?ie=UTF8&s=mobile&qid=1298676328&sr=8-1
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I purchased this product mainly because I was sick and tired of running down one battery and then having to switch without a way to charge the first one. So at the end of the day I would have two dead batteries. This can charge the battery in your phone as well as a spare. You can charge any size battery in the spare battery tray, which is really cool.
You can see from the image how it works. Because of the stupid design of the Epic4g charging port, it requires a cable to be plugged into the top of the phone. There are two led's, one red for the spare battery in the back and one blue for the phone. There are two ways to charge the phone, USB and a wall plug. The spare battery requires that the wall plug be used to charge. The phone will charge with either the wall plug or the USB cable.
The dock does not fit any extended case. The Epic naturally leans back in the slot, but it can be wiggled forward a good inch.
From the 10 minutes I have had and used this thing, I would absolutely recommend it. Please ask any questions you have.
does it come with the spare battery??
No. It comes with the dock and a wall charger.
I think you may have sold me on one. I have seen these before with an OEM battery but since I have Yoobao and my OEM battery already I don't need another. The price is right. thats for sure,
Yea, I figured it would be great for my needs. I dont need audio out or anything like that. Just needed something to charge the batteries while im not using them. Works flawlessly for that.
The blue charging LED on this thing is seriously the strongest LED I have seen. Huge blue circle on my ceiling.
I was browsing the web, and I found something interesting on Wikipedia:
Overcharge up to 5.2 Volts leads to the synthesis of cobalt(IV) oxide, as evidenced by x-ray diffraction
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So this basically means overvolting over 5.2V will make permanent damage to battery (if you look at the other reactions, the Cobalt Oxide can't be returned to original formula, so this will reduce battery LIFE)
Source
Normally phones have a built-in transformer.....
I believe they are talking about battery voltage. Lithium ion batteries are rated at around 3.7v but will have slightly over 4v when they are fully charged. Once your device charges to 100% it stops charging. You cannot overcharge a cell phone, laptop, etc. If you were to apply power directly to the battery contacts which is not recommended then you could overcharge. I belive what that is saying is if you went beyond the ~4v that a lithium battery is at when its charged to 100% and kept charging it up to 5.2v it would get damaged.
This is not talking about chargers which produce a nominal voltage of 5v. I've tested several USB chargers on a voltmeter and they read anywhere from 5.0 to 5.3 volts.
In this case, the USB charger is not so much a charger as a charging source.. the charging circuit is internal in the device and measures battery condition, temperature and voltage and will regulate down the 5V USB supply to the required charging voltage.
Attempting to increase the charging voltage source voltage from the generic USB levels to something higher will simply over-stress the onboard charging circuit to the point that it will fail due to excess dissipation.. and of course, there is no set of circumstances that says attempting to overcharge the battery directly at the terminals can possibly be a good thing
spunker88 said:
This is not talking about chargers which produce a nominal voltage of 5v. I've tested several USB chargers on a voltmeter and they read anywhere from 5.0 to 5.3 volts.
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I picked up the Nokia DT-900 from my local Verizon store for $49. When placing the device on the charger it will charge cycle a number of times before stabilizing into a charge. Last night I had a issue where I had to remove and replace the device because the charger was blinking after failure to charge 10+ times. The positioning doesn't matter as long as it's on the keystone, although the Nexus slides off rather easily.
The stock adapter is +12VDC 0.75A. I tried hacking in a +12VDC 1.75A transformer for faster charging rates but the device failed to do anything. I re-spliced the stock transformer and it still works. With daydream activated the keystone maintains to drains the battery as it cannot provide enough charge to power the device. For $49 this product is a compromise to failure in wireless charging technology due to charging rate and slick surface.
Battery Mix reports +/- 10%/hour charge
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Inside the device. The back pops right off with a proper tool. Notice the 3 temp sensors between the coils.
Underside of the circuit
The maximum charge rate is set for 789 mA and at 4ish volts this is less than 4 watts. When the battery gets full the rate goes down, so try again with an empty battery.
There is not much use in a bigger adapter.
This Qi charger isn't good, I tried it .
Bye!
! !
Nokia Qi charger and magnet
Hi, I'm sorry if the question is a nonsense but.... would a usual magnet, attached to the plastic cover of the charging plate, interfere with charging capabilities of the plate? or is there any Qi standard wireless charger, which would hold the phone with a magnet? would be a good charging accessory of the car.
thank you
Ended up returning mind and going with the WCP-300. Had little to no luck with these, zero issues with WCP-300.
Sent from my Nexus 4 using Tapatalk 4
I got one of these.. and the 1st few times I tried it, it was working great.. no issues at all...
now I can't get my N4 to stay charging for more than 5 minutes (then it stops, beeps, tries again, fails, etc)... I leaning towards returning it.
Does anyone know what the thickness without the casing is?
I've got some new tear down pics I will post soon. I just ended up using this charger in my car based on your review and a few others. thanks for posting this.
lukihnio said:
Hi, I'm sorry if the question is a nonsense but.... would a usual magnet, attached to the plastic cover of the charging plate, interfere with charging capabilities of the plate? or is there any Qi standard wireless charger, which would hold the phone with a magnet? would be a good charging accessory of the car.
thank you
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I would also like to know this!
I've heard no but it goes against the physics, so I'd say yes. It's not a good idea to have magnets next to a phone anyway, unless it's a weak case one. That ought to be OK on the charger too
By backwards engineered alien technology.....
feanor3 said:
Does anyone know what the thickness without the casing is?
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http://imgur.com/b6S52RE
6 mm
You can open it up like this to make it thinner:
http://imgur.com/x5QyghB
4 mm PCB with power plug
3 mm PCB without power plug (if you solder your own power supply to it from car cigarette lighter for example which also regularly uses same 12 volts as this Qi charger takes as input)
4 mm coil
All measurements are approximate.
Has anyone tried using a non-OEM battery with a Quick Charge 2.0 charger? I've had a TrendON battery as a spare for a while but just decided to swap it with the OEM Samsung battery. After it dropped to roughly 60% I put the phone on an Anker QC 2.0 charger and watched the realtime power with a Portapow Premium DC Multimeter. It was initially drawing 15 watts (9V * 1.67A) and the charging light was green on the charger, indicating fast charging.
After a few minutes I took another look and while the voltage was still at 9V, the current was near zero. The phone was taking in milliwatts of power. I actually let it sit for a few more minutes and then restarted the phone thinking something was off. After restarting I let it sit a few more minutes and then confirmed that the battery percentage wasn't rising. It was stuck around 77%.
I took it off the fast charger and then put it on a "standard" 2A Anker charger and then the battery percentage continued to climb regularly. Really odd.
Anyways I have a graph showing the entire behavior. The green line is battery percentage and the orange line is charge rate as a delta of battery % per hour.
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The fast charger has worked flawlessly in the past when I had the OEM battery installed. I'm guessing that if the phone was drawing 0 watts it had shut down the charging of the battery for one reason or another. Thoughts?
I have been using oem charger with my 2 anker batteries without any issues for almost over a month.
Hmm... just took a peak at my phone and it's actually stalled out at a reported 80% of battery capacity, and this is not on a QC 2.0 charger. This may be a battery issue as I believe battery percentages are calculated relative to battery voltage. I'll reach out to the manufacturer, TrendON, but not holding my breathe as it's been a few months since I purchased it.
Hi
I have problem with charging on my U11 with the stock charger and my anker charger with QC3. If i use the normal ports without QC3, I can get 5v and almost 2A.
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But on the voltage bumps up to 7.5v, the current drops drastically to 0.1-0.3a and it wont charge to 100% overnight. I am thinking my phone is having problem as it behave the same on 2 chargers. Any thoughts?
(The picture shows higher current because my phone is on and camera app is running. If phone is off, current is 0.1 to 0.3A)
If the battery is near full you won't get full power. It ramps down to prevent over charging. QC3 is dynamic charging and uses a negotiation routine.
Beamed in by telepathy.
shivadow said:
If the battery is near full you won't get full power. It ramps down to prevent over charging. QC3 is dynamic charging and uses a negotiation routine.
Beamed in by telepathy.
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While what you said is indeed true, that's not exactly the case the OP is experiencing. I say this because he won't charge to full even overnight. Sure, 99% to 100% takes slightly longer, but I believe it's definitely under 5 minutes.
OP, let me share my experience. I have one original HTC charger, one non-original HTC branded charger (half the price of an original, I don't care if it's a fake as long as the quality holds up), and a Xiaomi powerbank that supports two-way QC3.0 (meaning it quick-charges devices but can also be quick-charged itself).
1) The original charger and non-original both work perfectly, quick-charging my HTC U11.
If I charge this Xiaomi powerbank with a normal charger (5V/2A), it also quick-charges my HTC U11 almost as well as the wall chargers.
2) But, if I quick-charge the Xiaomi powerbank itself with a QC3.0 charger (18W), such as the two wall chargers mentioned above, then I have the same issue as you- namely that the powerbank becomes unbearably slow in charging the U11.
3) The way to fix this is to have the powerbank use up all its power then be recharged by a normal charger as in 1). Another way is use the powerbank to charge a normal device, one that doesn't use quick-charge. In both these cases the duration must be for over 2 hours, after which I suspect the "safety mechanism" of the Xiaomi will deactivate and make things normal. Obviously I'm not too happy with this powerbank so will be returning it shortly.
So OP you might wanna try something like charge your phone fully first with non-QC, and the same for your powerbank. Then try charging the phone again using said powerbank.