Database Info

5v 1000mA charger

Would it be safe to charge the batter at 1000mA compared to the stock 700mA the charger provides?

yes, i do it all the time

I use the charger from the Galaxy Tab all the time, it's rated at 2A and the S does see it as a proper charger. I've not checked, but I also think it charges the phone faster than the stock charger.

terje.tel said:
I use the charger from the Galaxy Tab all the time, it's rated at 2A and the S does see it as a proper charger. I've not checked, but I also think it charges the phone faster than the stock charger.
Click to expand...
Click to collapse
yes it does
the higher the Amp, the faster it charges
however this is not compatible with all phones
the SGS is a good phone, my Motorola will not charge if you exceed or you are under the original charger spec (which is totally stupid) but i understand it is to protect the phone, from over heating
SNS also accepts higher output chargers

So can I use this ?
actually it is ipad charger, 5.1V 2.1A output.
On the phnoe label it is printed max~1000mA
but this is 2.1A.....(2100mA)
it seems too high...
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

The battery might heat up to a high temp and if done regularly it could very well shorten the life span significantly.. the stock 700mA charger makes the battery warm, Im guessing that 2100mA will make it very hot, but you can try for like 30mins of charging see if thats the case.. if you can just say its warm then I would presume its safe.
700 to 1000mA charging has very little difference on the warmth that i feel from the battery.

If you have the International Galaxy S GT-I9000 it won't charge any faster than about 450mA regardless of the charger rating (from my tests). You can get a higher-capacity charger but it won't make any difference and is quite safe so long as the voltage is correct.

TheBeano said:
If you have the International Galaxy S GT-I9000 it won't charge any faster than about 450mA regardless of the charger rating (from my tests). You can get a higher-capacity charger but it won't make any difference and is quite safe so long as the voltage is correct.
Click to expand...
Click to collapse
The International Galaxy S I have comes with a 700mA charger though, there is a noticeable charge difference between a USB port (500mA) vs the stock charger (700mA) and my 1000mA charger

If 2100mA is also supported, the charge time will become in just 43min (in theory).
And if the charge circuit is safe enough, it will control the current to 700~1000mA, and it will drive below 200mA in the beginning of charge.
Just try plugged to my phone, it is charging as USB not AC,
so I think the currect will limit to 500mA.....
will try again later, my battery is still full now.

If theres a 500mA limit why do I get faster charging speeds with the wall charger compared to the USB ?

EarlZ said:
If theres a 500mA limit why do I get faster charging speeds with the wall charger compared to the USB ?
Click to expand...
Click to collapse
That's the question..
I'm using data cable, so the phone just detect plugged to USB i/o AC power.
maybe I need to use straight miniusb power cord.
Then it will really challenge the phone in 2.1A
On the other hand, IP4 & Ipad can draw 1A from computer USB, (need new motherboard)
what about Galaxy S !?
I will test it later.

terje.tel said:
I use the charger from the Galaxy Tab all the time, it's rated at 2A and the S does see it as a proper charger. I've not checked, but I also think it charges the phone faster than the stock charger.
Click to expand...
Click to collapse
If the charge time is less than one hour,
you are getting benefit of high current.

johan8 said:
That's the question..
I'm using data cable, so the phone just detect plugged to USB i/o AC power.
maybe I need to use straight miniusb power cord.
Then it will really challenge the phone in 2.1A
On the other hand, IP4 & Ipad can draw 1A from computer USB, (need new motherboard)
what about Galaxy S !?
I will test it later.
Click to expand...
Click to collapse
Im not 100% sure but the USB 2.0 specification is 500mA only.

EarlZ said:
Im not 100% sure but the USB 2.0 specification is 500mA only.
Click to expand...
Click to collapse
Yes I know.
But IP4 and Ipad is also USB2.0

johan8 said:
Yes I know.
But IP4 and Ipad is also USB2.0
Click to expand...
Click to collapse
In relation to what you said that IP4 and IPxD can draw 1A, thats why I said the USB 2.0 spec is only 500mA so those devices cant draw more than 500mA on a USB port.

EarlZ said:
In relation to what you said that IP4 and IPxD can draw 1A, thats why I said the USB 2.0 spec is only 500mA so those devices cant draw more than 500mA on a USB port.
Click to expand...
Click to collapse
IP4 is USB2.0 Device,
plug into high power USB port (that is USB3.0 port)
USB2.0 IP4 can draw over 500mA
I know what you mean, if the source is USB2.0 of course you can't draw higher than 500mA.
My point is, if the device can draw higher than 500mA, just like the usb2.0 IP4,
and if galaxy s can draw that high,
then we can get benefit from the high output usb ports and also that high output usb charger.

Hello everybody,
I want to share my experience.
So I have a Samsung galaxy S, and usually I charged it with the original charger (700mA).
I tried with a 1000mA one. The charger was really faster than with the original one. So I thought that if I buy the galaxy tab's charger (2000mA) it would be faster.
It's what I did. But the problem is that it's not faster with this one than with the 1000mA one.
I think the problem comes from the USB limit of charge (1000mA in a outlet, 500mA on a USB port from a computer).
But I have a problem with this... I mean, the galaxy tab is charged by an USB cable too, even if it's not the same plug out (I don't know the name of this plug out, I know on the galaxy S it's a micro-USB) on the cable, it's still an USB cable. So why this USB cable can give 2000mA while it uses an USB technology ?

it's definitely faster charging on a 1200 nokia charger..
Sent from my GT-I9000 using XDA App

I can't help myself and I must tell you guys something. The mA of a charger means how much current it can provide in 1 hour, imagine it like a pipe through which only a ammount of watter can pass. Now going back to the phone... We have a 1500mA batt which means that if we use a 25000mA charger it will only output 1500mA... So it is useless to use a more powerfull charger than 1500mA. I hope you understand what I said

That is a 1500mA*h* battery which means capacity and not current.
Sent from my GT-I9000 using XDA App

[Q] Voltage on unofficial micro USB charger

My GF ran over my mains charger cable with the vacum cleanerr at the weekend, so i ordered i new one from Ebay. Rather stupidly (as an "official" one would only be £1 more), i bought this unbranded one:
UK MAINS CHARGER FOR SAMSUNG i5700 i9000 GALAXY S on eBay (end time 02-Apr-11 14:51:41 BST)
When it arrived i noticed that the output is different: 5.5v 500ma as opposed to 5v 700ma from the one that came with the phone.
I know tha ampage will affect charging speed, but am concerned about the extra 0.5 voltage. Is this safe to use?

I'm curious about this too... I thought the "U" in USB meant Universal.
I just ordered 2 micro USB chargers from Ebay for my GF's Sony Vivaz Pro and my Captivate... neither work.
Her's doesn't recognize the charger at all... mine beeps and says "charging", but the battery level never goes up.
My chargers are 5v 500mA.
The chargers were listed as Blackberry chargers, but had a long list of compatible phones underneath (none matched our phones, to be fair.)
Now I'm afraid to buy any more generic chargers....

I don't know if the output voltage is part of the USB standard or not. I know that computers output 5v and it seems like a lot of phone chargers also do. However, i've seen some external battery chargers listed as compatible with the SGS listed as 5.2v, so maybe theres an accepted voltage range? Does anyone know for sure if a 5.5v is acceptable?
I'm not sure why the ones you have don't work as the specs seem right,possibly they are faulty?

paddyb said:
I don't know if the output voltage is part of the USB standard or not. I know that computers output 5v and it seems like a lot of phone chargers also do. However, i've seen some external battery chargers listed as compatible with the SGS listed as 5.2v, so maybe theres an accepted voltage range? Does anyone know for sure if a 5.5v is acceptable?
I'm not sure why the ones you have don't work as the specs seem right,possibly they are faulty?
Click to expand...
Click to collapse
Yeah, I'm not sure. I certainly thought so, even though it seemed pretty "unlucky" they both might be faulty.
I did ask the seller, and they claim they are NOT compatible with my phones, but I just don't get it. They're offering me a refund, but at $4 each it's hardly worth my time mailing them.
I found some forums online of a small handful of people like me with chargers that won't work. It seems people with this issue were using 500mA chargers, and anyone using a 700 or 1000 had no problems. This wasn't necessarily because all phones either require 500 or 1000.... Someone also said it's only very certain phones that are built this way. That they require newer, or more powerful chargers... but that it's not the case with all new phones/smartphones.
But there were others who said 500 should charge it, just more slowly.
I still think Micro usb is Micro usb, period. That's why the EU (and here) have been looking at making these chargers universal. I think I'll just try my luck again with another charger.

You could try this one, which claims to be (and looks like), an official SGS charger:
http://cgi.ebay.co.uk/Samsung-i9000...ories_MobilePhoneChargers&hash=item2c5b2d355a

5.5V is supported. I've tested a very wide range of chargers for my SGS and all worked.
The voltage range of these chargers is 4.8V - 5.6V and all worked just fine.

I've actually got an original Nokia USB charger which is declared at 5.0v/550mA and it works like a charm...
Model is AC-6E:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

Well finally decided to give the ebay charger a go. Plugged it in, a green light lit up and plugged the phone in. The phone didn't recognise the charger, no indication the the notification bar that the battery was charging. Unplugged it and and tried again, and now the light on the charger doesn't even come on! Won't be using it again.

Another question on the topic : Is it save to use charger with higher Amperage ?
I mean original samsung one is 0.7A, could something go wrong if I´ll use 1.0A charger? Thanks
EDIT : Answer no needed anymore - found it in another topic. It should be safe

I believe any microUSB charger will be safe. Ideally, you want the highest voltage and highest current possible.
I've heard that the phone will use the data lines to tell the USB charger what voltage to set. This ensures voltage compatibility. Then the phone itself regulates the current.. it will only draw as many amps as it needs. So if the PSU can handle 2A, your device may only draw 0.725a for example, but it's safe. You want a high current one to ensure the phone has all it can take.
BTW, I'm not an EE person, so double check what I said.

I fear it's not that simple, especially with dumb chargers that can't negotiate current using the USB protocol, and instead may short the data lines, in various ways, instead to tell the device what current to draw...
Sent from my GT-I9000 using xda premium

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.

Would i **** it up pluging a 5.8 volts solar charger on my phone?

projeto56 said:
Would i **** it up pluging a 5.8 volts solar charger on my phone?
Click to expand...
Click to collapse
It's a bit too high.
You have to know that slow charge = long battery life and fast charge = more battery drain after a couple of years maybe months

HdX75 said:
It's a bit too high.
You have to know that slow charge = long battery life and fast charge = more battery drain after a couple of years maybe months
Click to expand...
Click to collapse
So usb charging is better then wall charging with original charger? because i noticed that my phone hold it`s charge better if i use the wall charger.

Pezmet said:
So usb charging is better then wall charging with original charger? because i noticed that my phone hold it`s charge better if i use the wall charger.
Click to expand...
Click to collapse
Maybe because the current is higher. My battery voltage is arround 4200mV at 100% and 4100mV with USB
For the solar charger 5.8 is really high but the wall charger is ok

guys can anyone tell me what would be the reason that my Samsung j7 prime charger is giving me 4.63v instead of 5v .. the rating is 5v on the charger. is that possible the ic or some other thing is damaged? in that case what would be solution?

[Read !!] Motorola Turbo Charger gets you 8 hours of battery life in 15 minutes

Check this out
http://blog.gsmarena.com/motorola-turbo-charger-gets-8-hours-battery-life-15-minutes/
Sagar Khanapurkar
Can this be used for our Nexus 5 ??

No.

Turbo Charge will certainly not work but it will charge your device at full capacity..
The Motorola Turbo Charger can be used on unsupported devices too but for those it only delivers 15W of power.
Click to expand...
Click to collapse

i bet itll charge the n5 a little faster, considering that we have qualcomms quick charge 2,0

simms22 said:
i bet itll charge the n5 a little faster, considering that we have qualcomms quick charge 2,0
Click to expand...
Click to collapse
no it will not work .charging current is limited to 900ma in ac mode by the device itself so no other charger can cange this.
but you can try the kernel mod for faster charging it will allow it to charge up to 2 amps D
http://forum.xda-developers.com/goo...el-modules-screen-dimmer-fast-charge-t2514765

primsam said:
no it will not work .charging current is limited to 900ma in ac mode by the device itself so no other charger can cange this.
but you can try the kernel mod for faster charging it will allow it to charge up to 2 amps D
http://forum.xda-developers.com/goo...el-modules-screen-dimmer-fast-charge-t2514765
Click to expand...
Click to collapse
All phones do this. Is protection against cheaper, poorly regulated chargers. Qualcomm quick charge will likely have detection methods in place to override this
Actually we're limited to 900 for USB 3. AC is more. 1500 I think.
Sent from my Nexus 5 using Tapatalk

primsam said:
no it will not work .charging current is limited to 900ma in ac mode by the device itself so no other charger can cange this.
but you can try the kernel mod for faster charging it will allow it to charge up to 2 amps D
http://forum.xda-developers.com/goo...el-modules-screen-dimmer-fast-charge-t2514765
Click to expand...
Click to collapse
that can not be true. i use an app, currentwidget, to watch my intake while charging. and i see more than 900ma in AC. my charger is a 4.1amp dual usb charger.

primsam said:
no it will not work .charging current is limited to 900ma in ac mode by the device itself so no other charger can cange this.
but you can try the kernel mod for faster charging it will allow it to charge up to 2 amps D
http://forum.xda-developers.com/goo...el-modules-screen-dimmer-fast-charge-t2514765
Click to expand...
Click to collapse
my current widget shows 996mA
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

simms22 said:
that can not be true. i use an app, currentwidget, to watch my intake while charging. and i see more than 900ma in AC. my charger is a 4.1amp dual usb charger.
Click to expand...
Click to collapse
that can be some offset or alredy the phone what ist discharging because at nearly 90% it schould not charge with full power
the fact is that the service manual say that normal charging is at 900 in ac mode fixed over the i2c bus to the (bq24192 charging chip)
that limit can be eliminated with that kernel module . after that there is a hardware portection with a resistor that limit the current to 2 amps (in my case 1.944ma )
when you will make a hardmod it will be possible to drive up to 4,5 amps (the bq24192 is capable of this but i think that then will burn the usb plug away because it get a bit hot on 2 amps

primsam said:
that can be some offset or alredy the phone what ist discharging because at nearly 90% it schould not charge with full power
the fact is that the service manual say that normal charging is at 900 in ac mode fixed over the i2c bus to the (bq24192 charging chip)
that limit can be eliminated with that kernel module . after that there is a hardware portection with a resistor that limit the current to 2 amps (in my case 1.944ma )
when you will make a hardmod it will be possible to drive up to 4,5 amps (the bq24192 is capable of this but i think that then will burn the usb plug away because it get a bit hot on 2 amps
Click to expand...
Click to collapse
996mV isnt full power charging. when its at 1300mV-1500mV you can say its at full power. and you seem to forget, the default charger is only at 1.2 amps, google sells a 1.8 amp nexus charger as well, they call it a speed charger.

simms22 said:
i bet itll charge the n5 a little faster, considering that we have qualcomms quick charge 2,0
Click to expand...
Click to collapse
rootSU said:
All phones do this. Is protection against cheaper, poorly regulated chargers. Qualcomm quick charge will likely have detection methods in place to override this
Actually we're limited to 900 for USB 3. AC is more. 1500 I think.
Sent from my Nexus 5 using Tapatalk
Click to expand...
Click to collapse
primsam said:
no it will not work .charging current is limited to 900ma in ac mode by the device itself so no other charger can cange this.
but you can try the kernel mod for faster charging it will allow it to charge up to 2 amps D
http://forum.xda-developers.com/goo...el-modules-screen-dimmer-fast-charge-t2514765
Click to expand...
Click to collapse
The charger will work on our phone and would likely push close to 2a or 10W because this is the hardware limit of our devices, though the charger is capable of pushing 3a or 15W. 900mW is for USB 3.0. OPO 2a charger charges my N5 about 1.5x faster than the stock 1.2ma charger.

Turbo Charging won't work. I believe thats only for the Moto Devices. Quick Charging should work. As mentioned, our device has the Qualcomm 800 processor with quick charging capabilities. You won't get the Turbo charging speeds but faster than a normal charger. I think this is what it will give the Nexus 5:
a Quick Charge 2.0 enabled device went from 0% to 60% charge in 30 minutes, while a device without Quick Charge 2.0 using a conventional (5 volt, 1 amp) charger achieved just a 12% gain in the same 30 minutes.
Click to expand...
Click to collapse
Source: https://www.qualcomm.com/news/snapdragon/2014/06/04/quick-charge-20-has-arrived

jsgraphicart said:
Turbo Charging won't work. I believe thats only for the Moto Devices. Quick Charging should work. As mentioned, our device has the Qualcomm 800 processor with quick charging capabilities. You won't get the Turbo charging speeds but faster than a normal charger. I think this is what it will give the Nexus 5:
Source: https://www.qualcomm.com/news/snapdragon/2014/06/04/quick-charge-20-has-arrived
Click to expand...
Click to collapse
i think that quick charging also is not working because in the nexus 5 the cpu has nothing to do with the charging ( it is all controlled by the bq24192 charging chip from Texas instruments)
i made some quick measurements and figured out that the voltage in ac mode is very critical
it should be at least 5v because with a voltage of 4.990 the current will already begin to fall.
with 4.9v the phone charge only wit 780ma and mine will need 5.010v to charge with 1A ( my bq24192 is a little bit out of spec. it schould only have a current limit failure of about 7,5% )
when you go further with the voltage it will also charge faster then only the current is limited (P=U x I)but the phone will lockout at nearly 7V because of the over voltage protection
so i think the best will be to by a charger that deliver at least 5.1v .
with the kernel module it is a little bit different , the the current will rise at nearly 2A at 5.6v so when you will have fast charging with the n5 you will need a charger that has 5.6 volts minimum and can deliver 2 amps.
otherwise the mod will not take its full power out .
full current
alredy a little drop in current but already nearly 20% slower charging
massive drop in current and charging speed (35% slower than with 5.3v )

primsam said:
i think that quick charging also is not working because in the nexus 5 the cpu has nothing to do with the charging ( it is all controlled by the bq24192 charging chip from Texas instruments)
i made some quick measurements and figured out that the voltage in ac mode is very critical
it should be at least 5v because with a voltage of 4.990 the current will already begin to fall.
with 4.9v the phone charge only wit 780ma and mine will need 5.010v to charge with 1A ( my bq24192 is a little bit out of spec. it schould only have a current limit failure of about 7,5% )
when you go further with the voltage it will also charge faster then only the current is limited (P=U x I)but the phone will lockout at nearly 7V because of the over voltage protection
so i think the best will be to by a charger that deliver at least 5.1v .
with the kernel module it is a little bit different , the the current will rise at nearly 2A at 5.6v so when you will have fast charging with the n5 you will need a charger that has 5.6 volts minimum and can deliver 2 amps.
otherwise the mod will not take its full power out .
full current
alredy a little drop in current but already nearly 20% slower charging
massive drop in current and charging speed (35% slower than with 5.3v )
Click to expand...
Click to collapse
Too technical for me

So buying Speed Charger by Google will be a better option rather than going for Motorola Turbo Charger ?

[Q] Does "Quick Charger UCH10" support Z3 ?

Sony announced Quick Charger UCH10 for Z3+ that's works with Qualcomm quick charge 2.0 as you know
Did any one try it on Xperia Z3 ?? and what are the results ??
http://www.sonymobile.com/global-en/products/accessories/quick-charger-uch10/
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

If it's QC2.0 compliant it should work, since other QC2.0 chargers work.

There's been a number of posts about quick charge only being enabled on Japan Z3 & Z3c variants. QC 2.0 is supposed to charge to 60% in 30 min, but I've seen VERY few people get anything more than 1% per min.

PuffDaddy_d said:
There's been a number of posts about quick charge only being enabled on Japan Z3 & Z3c variants. QC 2.0 is supposed to charge to 60% in 30 min, but I've seen VERY few people get anything more than 1% per min.
Click to expand...
Click to collapse
It's enabled, but Sony does not use it as aggressively as some devices with removable batteries. You won't see much improvement with the screen off and a GOOD 2.0A charger with a very short USB cable, but you'll see some. You'll see major improvements when running Google Maps Navigation in a car - many charger/cable combos can't even keep the battery steady, while a QC2.0 car charger will charge the device at a reasonable rate even through a long/thin (normally VERY poor for charging) USB cable.
Sony's charge rate cap is 1500 mA (0.5C) into the battery. With screen off and a high-quality charger, you'll hit this cap inconsistently (frequent drops to around 1.2A from the cap of 1.5). With a QC2 charger, you'll hit that cap consistently even with the screen on and a crappy USB cable.

Entropy512 said:
It's enabled, but Sony does not use it as aggressively as some devices with removable batteries. You won't see much improvement with the screen off and a GOOD 2.0A charger with a very short USB cable, but you'll see some. You'll see major improvements when running Google Maps Navigation in a car - many charger/cable combos can't even keep the battery steady, while a QC2.0 car charger will charge the device at a reasonable rate even through a long/thin (normally VERY poor for charging) USB cable.
Sony's charge rate cap is 1500 mA (0.5C) into the battery. With screen off and a high-quality charger, you'll hit this cap inconsistently (frequent drops to around 1.2A from the cap of 1.5). With a QC2 charger, you'll hit that cap consistently even with the screen on and a crappy USB cable.
Click to expand...
Click to collapse
Thanks for the info! But isn't 1.5A charging capacity closer to the old QC 1.0 standard that came out a couple years ago? In order to qualify as QC 2.0, shouldn't the charge rate be higher? Is this why Sony does not advertise quick charging on either of these phones?

PuffDaddy_d said:
Thanks for the info! But isn't 1.5A charging capacity closer to the old QC 1.0 standard that came out a couple years ago? In order to qualify as QC 2.0, shouldn't the charge rate be higher? Is this why Sony does not advertise quick charging on either of these phones?
Click to expand...
Click to collapse
1.5A into the battery, but don't forget that you need to power the device also.
Let's assume a battery with a voltage of 4.0 volts. Typical system power consumption when idle with the screen off and external power disconnected is 700-900 mA = about 3-3.5 watts. That's when sitting at the launcher doing nothing.
So now that we know the system power budget when screen on and idle, let's calculate how much power is needed to charge the device at full rate:
1.5A*4.0 volts = 6 watts. This goes up to around 6.5 watts at 4.35 volts
So the total power to run the system AND charge at 1.5A is 6 + 3.5 = 9.5 watts and this is with the system sitting at the launcher totally idle.
Also, typical switching regulators are only 80-90% efficient. Let's assume 90% here.
So we need 9.5/0.9 = 10.5 watts input
A 2.1A 5v power supply can only deliver 11 watts into the cable. Cables aren't ideal and have resistance, so you're going to lose power in the cable at 2.1A.
Try to do anything with the device and there is no longer system power budget to keep the battery charging at 1.5A. Also, see the above about cable losses? Every charger chipset I've seen backs off when vbus drops below 5.0-5.1 volts or so. The 2012 Nexus 7 dropped 200 mA for every 0.1 volt drop below 5.1 volts for example.
QC2.0 ups vbus to either 9 volts or 12 volts (9v in nearly all configurations I've seen, SHIELD Tablet is one exception). 9 volts at 2A = 18 watt power budget instead of 11. Also, for a given power delivery amount, there's less cable losses at 9 volts than at 5, and the system can tolerate much more input voltage drop.
Try running Google Maps Navigation with this USB cable - http://www.amazon.com/StarTech-com-Micro-USB-Cable-UUSBHAUB3RA/dp/B001AR4NC8/ - If you use any standard 5v charger, your battery will discharge because there just isn't enough power to even keep the screen/CPU/GPS fed. Use a QC2.0 charger and you'll see the battery actually charge at an acceptable rate.

Fast Charging "Homemade". What are the risks?

I lost my original Fast Charger in my school and now I'm without one. The problem is, that sometimes I need that great feature.
My question is, can I disassembly a random 9V charger and "adapt" a Micro-USB cable to it? Since the GS6 supports 9V I don't see a problem there. Or must I short some data pins in order to enable fast charging to not fry the device?

Why don't you just buy a new one?

I definitely think that's not a good idea. Buy a new one. If you are worried about Samsung charger price you can buy a cheaper charger that support Qualcomm 2.0 quickcharge, it's compatible.

I thought the whole thing was dynamic, that at lower battery levels it charges at different amperage than higher levels, and at a certain point it kicks over to 5V. It doesn't charge at 9V the whole time.
Sent from my SAMSUNG-SM-G920A using XDA Free mobile app

@quarlow is right, it's dynamic.
You should buy a new one, much more safe.

If I plug a normal 'old' 600mA 5V charger to it, it says that it will charge in 6 HOURS! I can't wait for that.
I have disassembled the charger, unsolded the Female USB plug and solded it to an 9V charger from an TP-Link Switch.
I plugged it in and the phone started charging. It says "Cable charging" instead of "Fast charging" and it stated 6 hours too. After that, I shorted the data pins and then the time reduced to 2 hours...
I also tried a 12V charger (1.5A), but it don't charged, nor maked any charging sound.
Now I concluded two things:
1. Samsung S6 phones are very robust with charger voltages :silly:
2. It isn't that easy to make a fast charger.
I hope I have saved some questions now
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Thanks for all the replies, but now I haven't money to buy one. Where I live, they are really expensive!
Oh, aaand, I don't know if it's a good idea to charge at 9V the whole time, because when it reaches 100%, I hear constantly the charging sound.

Looking at a Samsung Travel Adapter change...
https://www.dropbox.com/s/54xt2u315nn1tkt/2015-09-27 14.04.18-1.jpg?dl=0
Output is: 9v at 1.67A, or 5v at 2.0A. It's listed as an adaptive charger.

numloxx1978 said:
Output is: 9v at 1.67A
Click to expand...
Click to collapse
Thanks, I will search for an 9V charger that has this amperage.
Btw, some chargers have adaptive 12V output.... Is that QuickCharge 3.0?

A normal Samsung or LG charger of 1.8A/2A output still charge my S6 in about 1.5 hours. Get one from a relative or friend or buy one if the S6 charger is too costly

Fullmetal Jun said:
Get one from a relative or friend or buy one if the S6 charger is too costly
Click to expand...
Click to collapse
I tried already. These options are not available
:silly:

Info
Fusseldieb said:
I lost my original Fast Charger in my school and now I'm without one. The problem is, that sometimes I need that great feature.
My question is, can I disassembly a random 9V charger and "adapt" a Micro-USB cable to it? Since the GS6 supports 9V I don't see a problem there. Or must I short some data pins in order to enable fast charging to not fry the device?
Click to expand...
Click to collapse
the factory charger got in fire sometimes i don know abt home-made chargers... take care dude

You gotta be kidding. Spend $10 and get a QuickCharge 2.0 adapter.
Don't risk it. Samsung Fast Charge is the same thing as Qualcomm Quick Charge. It's Qualcomm's technology, licensed with no loyalty fee.
QuickCharge 2.0 uses the data pins to negotiate the charge voltage with your power adapter. Otherwise it just uses 5V.
I see on my S6 it stays at 9V all the time. The phone pulls the current it needs, so you don't have to try to match that current on the power adapter side. Just make sure it's at least 1.6A, preferably 2A. I never saw my S6 pulling 2A at 5V or 9V.

I'd imagen as this a form for devs . And this guy is trying to create somthing . The devs would be a bit more yaknow . Creative. First off
The guy is trying to make the adaptive charger .give him a bit of credit . I'm currently making a portable charger and I want it to use samsung fast charge
I'm using 18650 battery's 4.2 volts fully charged 3.7 volts give or take when they sag.
So if there is anyone with half a brain out there. How do you get the 9v (8.4) amp to make it a fast charger ( under one and a half hours. ) I'll worry about building the switch to the 5 volts after ( 4.2)
Is it loop the pins . Pin to earth pin to positive loop pins to negative ) the information isn't out there so surely some one has the information. ( just FYI the sgs6 is perfectly capable of being charged at 9 volts. The battery is a nine volt according to the build information explains why charging with any other charger takes 6 hours. .
Also to the op if you did indeed have a similar idea to me just tell erm straight I wanna mess about with low current and voltage dc haha. ( also I tried 18 volts samsung phones do no alow the charge over 9volts so it cannot hurt you're phone