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Not charging when connected with PC

I recently bought new tab, it is getting charged normally when plugged in power socket. But when i plug it in laptop USB port or any PC port, it would not charge instead I can transfer data etc. I am using the original USB cable which came in box. Does any one has faced same issue?
Sent from my GT-P1000 using XDA App

charging
Samsung have engineered it so you have to even use their mains charger. Car chargers and wall chargers have to be Samsung tab brand. Not sure but there is talk of AVUSB charge cable being released. Pretty sure this has already been covered.

Turn off the screen and wifi and data network and it will charge very slowly over usb.
Sent from my SGH-T849 using XDA App

The fact of the matter is the tablet requires more/not the right amount of power that your USB port can deliver.
We always here all these theories about why.. but here is the simple and only reason why.
To keep the techinical stuff short and simple, Li-Poly and other batteries have a predetermined lifetime and one of the determining factors to how long they last is the rate of charge (charge rate) time and the exact amount of mHa capacity of the battery.
This is NOT a Samsung marketing scheme as it is exactly the same reason the iPad cannot be charged through USB.
I'll give you a quick example:
If you buy rechargable batteries, Ni-Mh that state they can be charged at 2500mHa (capacity/rate) and you charge them on a 15 minute charger that delivers the right amount of power (1.2 volts) and not the correct rate (lets say they are rated for 2500 and you use a charger thats rated for more) this causes the battery life to be deminished drasitcally.
If you charge the same 2500mha batteries with a lower rating charger, they will take a lot longer to charge completely since it is at a slow mHa, but also this slower charging will provide a longer battery life.
Therefore their charger (and this is the reason why you must use their charger or any charger with the same mHa rating) is made to provide the optimal amount of charge rate (mHa) giving you the best battery life vs charge time.
In conclusion the Tabs hardware will limit the rate of charge through USB in order to:
a) Not overload the power on your USB, given that all this varies according to each system configuration (although it should not! but reality is.. it does)
and
b) In order to not improperly charge your tab, reducing your battery life.
I know the technical parts are vaguely/poorly explained but I work with Li-Po and other types so this is the simplest way to explain all this without causing too much confusion.
Hope this made sense
Cheers

tj1984 said:
Samsung have engineered it so you have to even use their mains charger. Car chargers and wall chargers have to be Samsung tab brand. Not sure but there is talk of AVUSB charge cable being released. Pretty sure this has already been covered.
Click to expand...
Click to collapse
Not true.
Samsung is using standard chargers that are wired to identify themselves as high current chargers. A non Samsung charger / external battery will likely have the same wiring because this wiring is part of the usb-specification.
The Tab will even charge from your usb-port but only slowly and if you turn off the screen since usb-ports only have 500mA (the charger has 2A).
So all the Tab does is check for this high-power-wiring. If it detects it it shows you the charge-icon, if it doesn't it assumes a usb-connection to your computer and does not pretend to charge (even if it does).

Interesting! So then a generic car cig lighter accessory with a standard USB port on it should charge it as a high output conection, right?

I am able to charge my Tab using usb connection to my PC by turning the device off. Same with an Energizer XP8000 external battery. Leaving the device on will take a long time to charge or not at all if you are using it while charging.

battery drain with car usb and gps

Hi
Using today the phone @ 100% brightness with car charger connected and using Sygic / Copilot, I see that my device can't not even charge at the same time that I am using it, but maintain their % of battery. Even with the charger the phone drains battery.
WTF samsung, So i cant make a long travel without running out of battery?
Anyone more with this problem?
PS: My HD2, HD, TyTN2, etc doesn't have this problem with the same car charger, they even charge at the same time.

What's the rating on your charger? I had to swap mine out for a 1A one in order to cope with GPS use in the car. Haven't had a problem since then.
I suspect the one you're using is 750mA or even potentially 500.

I have just had the same problem. I knew i needed a higher amp charger but i thought i would give it a try. The one i used is 650mA, so that's definitely not large enough. The normal 'house' charger is 0.7A (700mA) so in theory that size or above should charge whilst the S2 is being used.

I have a 1200 mA usb adapter for car (a sony ericsson, very very slim one) and I have no issues. You need a decent amount of power for that phone so 650mA will not do, have at least 1000.
http://www.nextag.com/Sony-Ericsson-AN400-Compact-853915153/specs-html
Not sure if this is the exact model but I found it to be the best because it's slim and there is nothing sticking out of the car socket, has a lot of power and I can power any usb device with it.

padlad said:
I have just had the same problem. I knew i needed a higher amp charger but i thought i would give it a try. The one i used is 650mA, so that's definitely not large enough. The normal 'house' charger is 0.7A (700mA) so in theory that size or above should charge whilst the S2 is being used.
Click to expand...
Click to collapse
Yest but probably you hava a chinese charger. The rating on it is never near the real one.

oh, I see, crappy charger, ill change then thanks guys

TomTom recently released a high speed multi charger. I replaced my old car charger with this one as I had a similar slow charge problem. Never had a problem ever since. All my weapons are always fully loaded with enough power! Expensive though!
http://www.tomtom.com/en_gb/product...-cables/high-speed-multi-charger-9UUC.001.04/

If someone is using a cheap higher-powered mains adaptor without issue, could you please post a (UK) link? Also if anyone knows of a cheaper alternative to the £20 car charger that would be great too!

I had same problem.I bought Samsung charger and no problem after
Sent from my GT-I9100 using XDA App

2.1 Amp TomTom charger is way too much for this device. Samsung wall charger is only rated at 750mA, but someone even found out that in source level Samsung has limited the power current at only 650mA.
With 1 Amp (1000mA) top quality car charger, the phone lost charge while using Navigation on full brightness.
Very slow charging in general for this phone.

shawt said:
I had same problem.I bought Samsung charger and no problem after
Sent from my GT-I9100 using XDA App
Click to expand...
Click to collapse
Same here

Mittaa said:
Same here
Click to expand...
Click to collapse
Can you provide a link? I'd like to get one

I bought mine on eBay for £6.Just search "genuine samsung car charger"
Sent from my GT-I9100 using XDA App

I bought today a Belking car charger of 2.1amps and suprise!, same problem battery drain.
Can be maybe the car? I doubt it, any idea?
http://www.belkin.com/IWCatProductPage.process?Product_Id=525940

When you have the car charger plugged into the phone go into Settings/About phone/Status & look at "Battery status"; it should tell you if the phone thinks it's plugged into a USB port (in which case the phone will draw only 450 mA) or an AC charger (from which the phone will draw 650 mA). These limits are built into the Samsung ROM, presumably to keep the phone cool and/or extend the battery's lifespan. They could be overridden (especially the AC charger current limit) in a custom ROM.
Absent a custom ROM, if the Status display says you're connected to a USB port, you could try a different charger, or connecting USB pins 2 & 3 (the two center pins on the USB A connector) together. That's how the phone decides if it's connected to a USB port or AC charger -- the low-resistance (less than 200 ohm) connection between the two USB data pins is the key. The spec calls for 200 ohms resistance between the data pins, but some of the low-end high current chargers I've seen just have a direct short.
If that doesn't work, or if the Status display says you're charging off AC, then try some of the other battery-life tricks documented here in the forums; they should reduce the device's draw from the battery, allowing the charger to do its job.

Wow, this is kind of disappointing i have to say. I have noticed the USB charging is incredibly slow. You can't ever rely on it, i think it would take close to 5 hrs to fully charge from USB, that's insane! By mains it's somewhere between 2 and 3, but that's still way too high.
I take it if you buy a higher-powered mains adaptor (not one for the car) then we'd definitely get the benefits of a faster charge? Can someone post a link to one they are using and know works faster that the stock one?
Cheers

I ll try ur tricks guyz.
for the time being this is my situation (and it sux):
-car charger 1A 5v
-slow chargin and hot device
-using navigator equals : phone burns, drains battery and in the worst scenario freezes
yesterday I received a call while phone plugged into car charger with navigator session. wot happened is phone freezed (screen didnt switch off) and I saw PROXIMITY SENSOR WAS RED!

shawt said:
I had same problem.I bought Samsung charger and no problem after
Sent from my GT-I9100 using XDA App
Click to expand...
Click to collapse
The first post got me worried for a while, but this info has put me back to ease. Pre-ordered the GS2 (India) and getting the original Samsung charger along as a freebie.

Yeah, i have simelar experience with the samsung s2 in my car.
Its eating the battery even when its plugged in and i think i have a good charger..
I found 1 solution.. I use now copilot, you can set different setting to disable the screen automatically when you drive a straigt forward for some kilometres, only when you need to turn it comes up again.
thats how i set it and it loads a little, but bad anyway.
Maybe thats what the + means in Super Amoled + (+batteryusage)

(•.•) said:
Maybe thats what the + means in Super Amoled + (+batteryusage)
Click to expand...
Click to collapse
nexus S didnt have such a problems. it's only around how samsung managed chipset.
I ll try to set cpu downclock while temperature goes over 40..

[SOLUTION] Slow Charging!

★★★This topic is for them who are having problems with stock charger and cable. If you don't have any problems, ignore this ★★★
Well, since I purchased my Note 2, I kept facing this slow charging problem. Now what is slow charging some of you will ask? Well, it's simple. The device is taking more than normal time for charging. Now how do you know the default/should be rate for charging? Simple again. The AC adapter clearly says output rate as 2000 mA or 2.0 A. So with that calculation Note 2's monstrous 3100 mAh should be fully charged with 2 hours. But as we've seen steady 2.0A is not the output case in some/many scenario, so add another 30 mins to it. So whatever it is, from 0-100%, the device shouldn't take more than 2 hours 30 minutes.
And for me, it was taking around 5 hours! Sometimes 4 hours 30 minutes, and if it's very fast then 4 hours. Well I was never gonna wait 4 damn hours before going to my office and irritate myself, and I don't have the habit of charging overnight, unless I absolutely need it.
So I kept calling my retailer, asked for replacement, and they did, well, you won't believe, they replaced three times actually, so I had three different Note 2, with three different charger. Well, each of them acted absolutely fine at first 3-4 charge, then the problem was back again and again. I in fact turned off the device and put it into trash once.
Then I thought let's try some different USB cables, I tried my friend's Galaxy Ace cable. Charging current kept fluctuating between 1000-1200 mA. Which was better than those faulty stock cables, which provided steady 900 mA. Sometimes it even was detecting the AC current as USB, which would provide a mere 460 mA and would take God knows how long! Then I found my piece. I went to my retailer, frustrated and angry, asked them to give me the thickest and shortest possible cable, and they provide me one from a Samsung phone's box, but I can't recall which device was that! And then I sat there for half an hour, kept plugging and unplugging, and the current rate was rock steady at 1800 mA. I took it, paid just 10$ and came back.
Since then I have charged my phone almost 10 times and the current rate never went below 1800 mA / 1.8 A.
This is the cable I am using, do notice that it has 5 pin set up against stock cable's 4 pi, if that matters in any way, and it's about 10% thicker than the stock cable and also about 9" shorter.
And how will you monitor the charging current, three ways are there,
1- Battery Monitor (yet I don't know how to exactly use it)
2- If you are rooted (which is a must anyway), then just go to, /sys/class/power_supply/battery/current_avg
3- Use the app from the link below. It basically reads the current value just exactly as above but it saves the time to go into that file every time. A big thanks to Deadvirus.
Galaxy Charging Current application's apk can be found here:
http://forum.xda-developers.com/showpost.php?p=36124435)?
Play Store link: (Paid)
https://play.google.com/store/apps/...S5hYm1hbnRpcy5nYWxheHljaGFyZ2luZ2N1cnJlbnQiXQ..
Thanks to this post and it's poster for informing us about the current output reading path,
http://forum.xda-developers.com/showpost.php?p=33585646&postcount=31

The included cable charger that mine came with charges fast like that, I let it charge slow with standard USB port overnight, but the included charger nd included cable should achieve this. The cable is important.

kebabs said:
The included cable charger that mine came with charges fast like that, I let it charge slow with standard USB port overnight, but the included charger nd included cable should achieve this. The cable is important.
Click to expand...
Click to collapse
Same here, it's done within about 2 hours every time, from ~1%. Something definitely must have gone wrong with yours :s

R: [SOLUTION] Slow Charging!
You are amazingly right. Every charger/cable combo I test seems to deliver different currents, according to the app you posted, ranging from 600 to 1300 (mA?).
Didn't know that could happen. Now I am looking for the Holy Grail of chargers, too.
After some tests: original chargers of Note 2 and Tab provide 1800 mA; no-brand Chinese labeled 1500 gives 1400; one Nokia labeled 1200 gives 1300, another, labeled 1200, gives 1200. Puro brand, labeled 2100, gives 1100. Another Chinese, no-brand, labeled 2000, double usb, gives 1100 per socket. Other no-brand samples give 600 or 300 mA.
Enormous variability.
Think I'll use the 1800 mA Samsung for when I'm out, and the good Nokia's for overnight charging when home.
Sent from my GT-N7100 using xda premium

And I ve been wondering why the heck original cable is too short. I thought samsung were just tight gits. Cable is mot even long enough to reach feom the wall to bed side table
Sent from my GT-N7100 using xda app-developers app

no problem whatsoever with mine , charging from 1 to 100 % in about 2 - 2:10 hours

Thank you for nice explanation! Now it's much clearer.
For me...
Stock charger + stock short cable (0,9 m) = ~2+ hours
Stock charger + some other cable (1,8 m) = ~4+ hours
,don't know about thicknes. Mb stock cable is thicker, or at least harder to bend.
Sent from my GT-N7100

Thanks for the APK, I found a huge variance in charging rates based on a combination of chargers and cables. Goes to show that the cable makes a huge difference. Here's my findings:
** Stock Charger (2A):
w/Stock Cable (4-pin) - 1698
w/Cable from another phone (5-pin) - 1698
w/Cable from battery pack (5-pin)- 1698
w/generic eBay cable (4-pin)- 100! - It didn't charge at all, even with screen off.
** iPhone Charger (1A):
w/Stock Cable (4-pin) - 1300
w/Cable from another phone (5-pin) - 1100
w/Cable from battery pack (5-pin) - 1300
w/generic eBay cable (4-pin) - 100!
** Car Charger (1A):
w/another generic eBay cable - 490
(Was running Redpill kernel, not sure if that has fast charging built in which might affect results).

The app is really helpful. Been wondering what the charging current was on different chargers.
I measured it using the app based on current AVG and not current NOW. This is because I used a 800ma blackberry charger and yet current now shows 1698 which is impossible.
The app will tell you which cables and chargers are good. I was shocked that out of my 8 cables only 3 gave an average of more than 1000, the rest give around 800 or less.
Sent from my GT-N7100 using Tapatalk 2

Hi!
So, the AC adaptater mentionne 2A but it doesn't mean that your devuce consume 2A... It means that the AC adaptater can provide 2A under 5V.
If a load need to consume 500mA the adaptater can provide enough power. But if it needs more than 2A, the ouput current will be at the 2A max but your voltage will decrease (it means that you have a device problem!).
The only thing to do is to refer to the user manual of device.
One thing more, the USB protocole fix the maximun current to 1A!
An other thing, if you want to have a better battery life it recommended to charge your battery slowly. Just have the habit to charge it during the night.
See ya.
Sent from my GT-N7105 using xda app-developers app

I also got an lg very thick cable..which is also 5 pin and let me tell it charges REEEEAAAALLLLYYYY FAST..when seen in application posted in op(thanx) it shows 1800..but the problem is if I detach charging before battery full notification then the battery is consumed at very high rate..I.e battery life decreased or maybe shows fake battery percentage. .and if I go for full charge it takes half hour more after 100% to show battery full in notification. .
Sent from my GT-N7100 using Tapatalk 2

lucier said:
Hi!
So, the AC adaptater mentionne 2A but it doesn't mean that your devuce consume 2A... It means that the AC adaptater can provide 2A under 5V.
If a load need to consume 500mA the adaptater can provide enough power. But if it needs more than 2A, the ouput current will be at the 2A max but your voltage will decrease (it means that you have a device problem!).
The only thing to do is to refer to the user manual of device.
One thing more, the USB protocole fix the maximun current to 1A!
An other thing, if you want to have a better battery life it recommended to charge your battery slowly. Just have the habit to charge it during the night.
See ya.
Sent from my GT-N7105 using xda app-developers app
Click to expand...
Click to collapse
Yes, the stock charger doesn't provide full 2A current.
And is it true that if the device is charged slowly the battery backup will be better? I mean that would be good then. I'll try that, thanks for informing.
sumeshd said:
I also got an lg very thick cable..which is also 5 pin and let me tell it charges REEEEAAAALLLLYYYY FAST..when seen in application posted in op(thanx) it shows 1800..but the problem is if I detach charging before battery full notification then the battery is consumed at very high rate..I.e battery life decreased or maybe shows fake battery percentage. .and if I go for full charge it takes half hour more after 100% to show battery full in notification. .
Sent from my GT-N7100 using Tapatalk 2
Click to expand...
Click to collapse
On my old cable, the damaged stock one, it'd take half an hour to reach 100% from 99. With this one it takes 5-6 mins.
This whole charging process is complicated that much I can say.
'Swyped' from my GT-N7100

Unfortunately I got a grey import so my stock charger was for a different country.
I'm having to use a 1.0A charger instead.
It still only takes a few hours to charge though. I sleep for 4-5 hours and it's always fully charged when I wake up.
Sent from my GT-N7100 using xda app-developers app

Hmm is this a accurate way of measuring amp?
I was using same cord and the apk provided above, using the default 2amp charger says 1697 and using a bellkin in charger rated at 1amp,says the same thing?
Hmm

I am a bit confused, which of the following is my actual charging rate? The charge is really slow, around 15% per hour or so.
Sent from my GT-N7100.
Those who help noobs go to heaven. True story.

As I stated in the screenshot, you shouldn't look at current_now, it'll always be same, 1698, you should look at current_avg.
'Swyped' from my GT-N7100

Damn. That means it's time for me to get a new charger, isn't it?
Just switched to a very old 0.7 A output charger my father uses on his primitive samsung device. It gives better results than my stock charger/USB cable, provided by samsung. 800 mA on a 700 mA charger. How is that even possible?
Sent from my GT-N7100.
Those who help noobs go to heaven. True story.

SacGuru said:
I am a bit confused, which of the following is my actual charging rate? The charge is really slow, around 15% per hour or so.
Sent from my GT-N7100.
Those who help noobs go to heaven. True story.
Click to expand...
Click to collapse
are using stock cable ?

yahyoh said:
are using stock cable ?
Click to expand...
Click to collapse
Yeah I am. The stock charger says 2A, 5V. When used with the stock cable it charges at a mere 200-400 mA. I used the wall charger of an old samsung phone (doesn't have a usb cable, just a wall charger) and current rises to 800mA. Where can I buy a good USB cable at in the UK?
Sent from my GT-N7100.
Those who help noobs go to heaven. True story.

I have buy a new stock charger because I was thinking my stock one was dead (slow charging / usb mode)...
But in fact it's not my stock charger who is defected but it's just the cable!!!
Just try with another cable and it's OK (AC mode).
Thanks for the apk!

Tablet is extremely picky with chargers

I have a Verizon Galaxy Tab 7.7 i815.
It's an amazing tablet for video playback because of the large AMOLED screen. Comparable to plasma screens.
So, the problem I have is that while it's great for this, it is also extremely picky on the charger. Basically, the only thing I can get to recharge this is with the Samsung usb charger that plugs into power.
It will not even charge from the computer.
And of course, it refuses to charge from portable power banks. This is kind of a big deal because the battery life of this tablet is pretty bad, so being able to use a power bank would be great.
Any idea why this is? How to fix? Maybe I just have a bad unit? What's going on?

taiwwa said:
I have a Verizon Galaxy Tab 7.7 i815.
It's an amazing tablet for video playback because of the large AMOLED screen. Comparable to plasma screens.
So, the problem I have is that while it's great for this, it is also extremely picky on the charger. Basically, the only thing I can get to recharge this is with the Samsung usb charger that plugs into power.
It will not even charge from the computer.
And of course, it refuses to charge from portable power banks. This is kind of a big deal because the battery life of this tablet is pretty bad, so being able to use a power bank would be great.
Any idea why this is? How to fix? Maybe I just have a bad unit? What's going on?
Click to expand...
Click to collapse
You need an adapter to charge with computer or battery or anything besides the stock charger. I was trying to find one on ebay without success. I will look again. The one I have is made by Pizen and was $2.

http://www.ebay.com/itm/FOR-Samsung...=Laptop_Adapters_Chargers&hash=item1c36f25bea
You need something like this.
Sent from my GT-P6810 using xda app-developers app

taiwwa said:
I have a Verizon Galaxy Tab 7.7 i815.
It's an amazing tablet for video playback because of the large AMOLED screen. Comparable to plasma screens.
So, the problem I have is that while it's great for this, it is also extremely picky on the charger. Basically, the only thing I can get to recharge this is with the Samsung usb charger that plugs into power.
It will not even charge from the computer.
And of course, it refuses to charge from portable power banks. This is kind of a big deal because the battery life of this tablet is pretty bad, so being able to use a power bank would be great.
Any idea why this is? How to fix? Maybe I just have a bad unit? What's going on?
Click to expand...
Click to collapse
Mine (a P6800) charges normally from USB (only with the screen off and charges VERY slowly, though; despite the battery icon showing an "X") and from my power bank. That power bank is chinese, got it from DealExtreme, and puts out 2A of current (the same as the stock charger). The battery icon also shows an "X" when charging from it, though.
Are you sure it doesn't charge? Or does it display an "X" but still charges when not in use?

Steve_max said:
Mine (a P6800) charges normally from USB (only with the screen off and charges VERY slowly, though; despite the battery icon showing an "X") and from my power bank. That power bank is chinese, got it from DealExtreme, and puts out 2A of current (the same as the stock charger). The battery icon also shows an "X" when charging from it, though.
Are you sure it doesn't charge? Or does it display an "X" but still charges when not in use?
Click to expand...
Click to collapse
Just for info.
The stock kernel will allow only USB charge at a rate of 450mA, regardless of a power bank or PC USB connection. Max AC is 1500mA.
my P6800/P6810 SkyHigh kernel will USB charge up to AC max (1500mA), using same device circuitry. The kernel is also modded to allow charging icon animation when connected to USB power source. This is because it thinks the source is AC. There are no System.UI.apk changes needed
Sent from my GT-I9500 using XDA Premium 4 mobile app

how do you install this?

taiwwa said:
how do you install this?
Click to expand...
Click to collapse
Sorry, the kernel will only work on P6800/P6810 devices (if that's what you're referring to). Was was info about charging rates...
Sent from my GT-I9500 using XDA Premium 4 mobile app

UpInTheAir said:
Just for info.
The stock kernel will allow only USB charge at a rate of 450mA, regardless of a power bank or PC USB connection. Max AC is 1500mA.
my P6800/P6810 SkyHigh kernel will USB charge up to AC max (1500mA), using same device circuitry. The kernel is also modded to allow charging icon animation when connected to USB power source. This is because it thinks the source is AC. There are no System.UI.apk changes needed
Sent from my GT-I9500 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
AC max is 1.5A? Weird... The charger is good for 2A, and we've got more than enough battery to charge at 2A safely. Any way to increase the AC limit on your kernel, maybe configurable by a file/variable/etc?
And I'm pretty sure the device charges at more than 450mA from my power bank. Just checked, and realized that the charging icon appears normally (on stock 4.1 kernel). Galaxy Charging Current reports a 2A current on my S3 (Temasek kernel, adjusted for a maximum of 2000 mA on AC, 1200 mA on USB3 and 650 mA on USB2). Some power banks appear exactly like an AC charger as far as the USB connection is concerned.

Steve_max said:
AC max is 1.5A? Weird... The charger is good for 2A, and we've got more than enough battery to charge at 2A safely. Any way to increase the AC limit on your kernel, maybe configurable by a file/variable/etc?
And I'm pretty sure the device charges at more than 450mA from my power bank. Just checked, and realized that the charging icon appears normally (on stock 4.1 kernel). Galaxy Charging Current reports a 2A current on my S3 (Temasek kernel, adjusted for a maximum of 2000 mA on AC, 1200 mA on USB3 and 650 mA on USB2). Some power banks appear exactly like an AC charger as far as the USB connection is concerned.
Click to expand...
Click to collapse
Why weird? Is all in the P6800 kernel source code.... I've not mentioned SGS3 ....
Those apps may just detect the source input, not the actual charge rate limited by kernel. Big difference afraid.
If the P6800 stock kernel detects it being charged as USB, all you will actually get is max 450mA. Same goes for AC, may show the source input greater, but charging rate is limited to max 1500mA. You can see my kernel commits on gitHub and study for yourself.
Remember, those charging current apps while useful, do have a large degree of variance as well.
Sent from my GT-I9500 using XDA Premium 4 mobile app

UpInTheAir said:
Why weird? Is all in the P6800 kernel source code.... I've not mentioned SGS3 ....
Those apps may just detect the source input, not the actual charge rate limited by kernel. Big difference afraid.
If the P6800 stock kernel detects it being charged as USB, all you will actually get is max 450mA. Same goes for AC, may show the source input greater, but charging rate is limited to max 1500mA. You can see my kernel commits on gitHub and study for yourself.
Remember, those charging current apps while useful, do have a large degree of variance as well.
Sent from my GT-I9500 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Weird because the charger that comes with the P6800 is rated 2A, and the P6800 battery is big enough to charge at 2A and stay under 0.7C. There is no reason at all to limit the charge to only 1.5A, unless the circuitry won't handle that (which would be a bad screwup by Samsung). I just asked if it is possible to change this "hard" limit on your kernel. I didn't mention the I9300 on this point, only as an example of a device where this is adjustable on custom kernels (it's also adjustable on your I9500, by the way, check Perseus kernel).
Actually, that app detect the actual charge rate as limited by the kernel (on the I9300). That app doesn't work on the P6800, because the kernel doesn't output those values. On the I9300, some kernels allow you to configure the maximum input current (@5V, from the charger) and the maximum current output (@~4.35V, to charge the battery). But that is not important; my point was just that some power banks (like mine) have the exact same USB connection as a regular wall charger, so the phone/tablet/whatever sees it as a regular wall charger even on stock kernel. The OP could search for one of those, if his device charges normally from wall chargers it will charge from a power bank like this.
And BTW, Apple chargers are crap, they won't output full current unless they detect an Apple device. So, no Android/WP/etc will charge correctly from an Apple charger.

Steve_max said:
Weird because the charger that comes with the P6800 is rated 2A, and the P6800 battery is big enough to charge at 2A and stay under 0.7C. There is no reason at all to limit the charge to only 1.5A, unless the circuitry won't handle that (which would be a bad screwup by Samsung). I just asked if it is possible to change this "hard" limit on your kernel. I didn't mention the I9300 on this point, only as an example of a device where this is adjustable on custom kernels (it's also adjustable on your I9500, by the way, check Perseus kernel).
Actually, that app detect the actual charge rate as limited by the kernel (on the I9300). That app doesn't work on the P6800, because the kernel doesn't output those values. On the I9300, some kernels allow you to configure the maximum input current (@5V, from the charger) and the maximum current output (@~4.35V, to charge the battery). But that is not important; my point was just that some power banks (like mine) have the exact same USB connection as a regular wall charger, so the phone/tablet/whatever sees it as a regular wall charger even on stock kernel. The OP could search for one of those, if his device charges normally from wall chargers it will charge from a power bank like this.
And BTW, Apple chargers are crap, they won't output full current unless they detect an Apple device. So, no Android/WP/etc will charge correctly from an Apple charger.
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Comparing kernels from different boards and CPU etc is like comparing apples and oranges.
If I could make the charge current configurable in my kernel, don't you think I would have already? Not everything is "cut and paste" and I expended allot of time in trying to port the mod for our current hardware.
Yeah, I've used just about all the kernels (at time of owing device) including perseus, siyah etc, do have good experienceI with configurable kernel charge. After using/having SGS2 x2, SGS3 x1, SGS4 x1 and SGT P6810 x1, it's not the first time I've heard of it.....
I won't be increasing max charge rate on the SkyHigh kernel above 1500mA. This generally increases battery heat and shortens lifespan.
On stock kernel + unmodified systemUI.apk for battery charge icons, if the kernel detects ANY charge source as USB, the max rate will be 450 mA. You will not see any battery charging animation (just the red x), which is a "sure fire way" to check.
In short, on our SGT-7.7, under stock conditions, if you connect ANY charging source and you DON'T have the battery charge animation, it will be USB charge at 450mA max.
Sent from my GT-I9500 using XDA Premium 4 mobile app

UpInTheAir said:
Comparing kernels from different boards and CPU etc is like comparing apples and oranges.
If I could make the charge current configurable in my kernel, don't you think I would have already? Not everything is "cut and paste" and I expended allot of time in trying to port the mod for our current hardware.
Yeah, I've used just about all the kernels (at time of owing device) including perseus, siyah etc, do have good experienceI with configurable kernel charge. After using/having SGS2 x2, SGS3 x1, SGS4 x1 and SGT P6810 x1, it's not the first time I've heard of it.....
I won't be increasing max charge rate on the SkyHigh kernel above 1500mA. This generally increases battery heat and shortens lifespan.
On stock kernel + unmodified systemUI.apk for battery charge icons, if the kernel detects ANY charge source as USB, the max rate will be 450 mA. You will not see any battery charging animation (just the red x), which is a "sure fire way" to check.
In short, on our SGT-7.7, under stock conditions, if you connect ANY charging source and you DON'T have the battery charge animation, it will be USB charge at 450mA max.
Sent from my GT-I9500 using XDA Premium 4 mobile app
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I didn't say it would be an easy/simple port, I just asked if it was possible. I didn't look at your github (and I have almost no experience with the P6800 kernel)... You know your sources better than anyone else, so I assumed you would understand better than I do what (and where) would need to be changed. I'm not diminishing your work or your effort in any way, shape or form; I respect the developers who stuck with this amazing device for so long, and who continue to make it usable way past what Samsung intended.
Our battery has a total capacity of 5100 mAh. From http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries:
The charge rate of a typical consumer Li-ion battery is between 0.5 and 1C
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That gives us a "safe" maximum charging rate of between 2550 mA and 5100 mA. 0.7C is generally agreed as a good rate for this first stage charge for Li-Po batteries, which means 3570 mA; the regulators on the tablet will reduce the rate when needed. Generally, charging Li-ion/Li-po batteries at such a low rate (~0.3C) is detrimental to the battery max charge, and a major screwup by Samsung (and explains why my P6800's battery doesn't last as long now as it did on its first month); that is why I asked. But that was just a question. If you won't do it, I respect your position.
About charging from the power bank, I don't get your point. As I said, when I plug my P6800 on my power bank, I don't get the red X; I see the regular charging animation, and the device charges as fast as it does on the stock wall charger (which is just an adapter that presents an USB connection where you plug the tablet's cable). I understand that when the tablet recognizes it's on a standard USB port, it will use the lower charge rate. But "power-only" USB ports, such as the one on the Samsung wall charger and the one on some power banks, will be recognized as power-only connections (or as the same as the Samsung wall charger), and will charge the device as fast as the kernel allows.
My power bank (this model to be precise) is detected as an AC charger on both my I9300 and my P6800, and would be a good option for the OP.

Don't get my point? Please 're-read the last paragraph in my previous post carefully.... I wasn't disputing your claim, but explaining about the battery charge icon.
Obviously your power bank has some "trickery" to fool the device as AC charge. Probably a resistor combo across the lines inside the source. This being the case, makes a good option for OP (or anyone else) on stock.

UpInTheAir said:
Don't get my point? Please 're-read the last paragraph in my previous post carefully.... I wasn't disputing your claim, but explaining about the battery charge icon.
Obviously your power bank has some "trickery" to fool the device as AC charge. Probably a resistor combo across the lines inside the source. This being the case, makes a good option for OP (or anyone else) on stock.
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yeah, one of my power banks would trick my tab on one of its ports. some resistor thing.

Its due to having resistors put across the data lines.
This is done to trigger the tablet into AC charging mode.
the wall charger has this done to it.
some batterys have a samsung charger cable or a micro usb adapter.
This adapter has resisters inside it.
i have one of these and charges on ac charging.
if i get another cable such as data or car charger etc..
it wont trigger charge even on 2 amps.
good news is a adapter can be made to go from usb to usb...look it up it has 2 resisters in it and also shorts the data lines to each other.

MRBR7 said:
Its due to having resistors put across the data lines.
This is done to trigger the tablet into AC charging mode.
the wall charger has this done to it.
some batterys have a samsung charger cable or a micro usb adapter.
This adapter has resisters inside it.
i have one of these and charges on ac charging.
if i get another cable such as data or car charger etc..
it wont trigger charge even on 2 amps.
good news is a adapter can be made to go from usb to usb...look it up it has 2 resisters in it and also shorts the data lines to each other.
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Click to collapse
Just as I presumed. Thanks
Sent from my GT-I9500 using XDA Premium 4 mobile app

I have a charger that has two usb ports in it. One says ipad and the other galaxy tab.
If I use the ipad one and use it on the 7.7 it thinks an usb device is connected, shows the charging icon and also the red x, but doesn't charge. I think it just has to do with the voltage it receives on certain pins, but what is the meaning of the cross?

Menster said:
I have a charger that has two usb ports in it. One says ipad and the other galaxy tab.
If I use the ipad one and use it on the 7.7 it thinks an usb device is connected, shows the charging icon and also the red x, but doesn't charge. I think it just has to do with the voltage it receives on certain pins, but what is the meaning of the cross?
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As it will accept a max of 450mA on detected "USB charge", it still should charge, but very slowly.
If you leave the screen off for a while, you should see the battery % indicator increase. If you use the tab while on detected USB charge, the device may consume more current than 450mA, hence the battery % indicator may not increase but instead decrease.
Sent from my GT-I9500 using XDA Premium 4 mobile app

[Q] What charger specification is best for Lg G2?

hello;
i have just bought LG G2 (F320L), i have noticed that if i charge the phone with a charger having 1amp output specification it charges rapidly.
So the question is that what charger output specifuication is best for Lg G2 which may charge the phone rapidly but does not damage the battery.

U can use a 16a charger if u want. The charging circuits in the phone handles the input so max the phone will use is 1.6a. It's li-po cells the phone has som advance circuits handling the balance charging of the cells. Recommended is 2a charger but don't forget the cable.
If u use a chappy cheap cable it won't go above 0,3a use a premium and u whill have a 1.6a charge. 1a is to little and to slow.
The phone handles the power to optimize the charging so don't be afraid to use a powerful charger just make sure it's 5v and above 1.6a. If u bye a 1.6 the charger itself will be on max load and generate a lot of heat with could damage the charger and the phone so go with 2a and a premium cable

I'm pretty sure the post above's first reference was meant to say 1.6A and not 16a (the second reference was corrected). 16A wouldn't necessarily hurt the phone actually since current aka amperage is pulled and not pushed - the device would still only take what it needs as long as the 5VDC is solid.
Anyway, enough rudimentary electronics and electrical theory...
Any modern USB wall charger will work with the G2 without issues, obviously if you can get and use one that provides a higher level of amperage/current it will charge the G2 faster up to about 1.6A as mentioned above. The factory charger included with G2 smartphones is designed to provide 1.8A but the G2 won't necessarily pull that much - the .2A is a little headroom and the charger doesn't "stress" as much to provide the 1.6A.
Lower amperage/current chargers just mean it takes longer to charge the G2, basically. As it has a 3,000 mAh (that's 3A for the record) that basically means with a 1.6A charger attached and the device powered off and charging exclusively you'll get a full charge in just under 2 hours from a near-empty state - if there's a charge on it already then it'll charge at roughly 1% every 2-3 minutes, maybe a touch more if the G2 is powered on and charging.
Either way, again, any modern charger will be fine. Try to get at least a 1A model from whoever, and avoid really cheap ones that can't do 1A minimum. If it's a brand name charger (Apple, Samsung, LG, Motorola, BlackBerry, etc) you'll be fine.

maydayind said:
U can use a 16a charger if u want. The charging circuits in the phone handles the input so max the phone will use is 1.6a. It's li-po cells the phone has som advance circuits handling the balance charging of the cells. Recommended is 2a charger but don't forget the cable.
If u use a chappy cheap cable it won't go above 0,3a use a premium and u whill have a 1.6a charge. 1a is to little and to slow.
The phone handles the power to optimize the charging so don't be afraid to use a powerful charger just make sure it's 5v and above 1.6a. If u bye a 1.6 the charger itself will be on max load and generate a lot of heat with could damage the charger and the phone so go with 2a and a premium cable
Click to expand...
Click to collapse
thank u for quick reply...
br0adband said:
I'm pretty sure the post above's first reference was meant to say 1.6A and not 16a (the second reference was corrected). 16A wouldn't necessarily hurt the phone actually since current aka amperage is pulled and not pushed - the device would still only take what it needs as long as the 5VDC is solid.
Anyway, enough rudimentary electronics and electrical theory...
Any modern USB wall charger will work with the G2 without issues, obviously if you can get and use one that provides a higher level of amperage/current it will charge the G2 faster up to about 1.6A as mentioned above. The factory charger included with G2 smartphones is designed to provide 1.8A but the G2 won't necessarily pull that much - the .2A is a little headroom and the charger doesn't "stress" as much to provide the 1.6A.
Lower amperage/current chargers just mean it takes longer to charge the G2, basically. As it has a 3,000 mAh (that's 3A for the record) that basically means with a 1.6A charger attached and the device powered off and charging exclusively you'll get a full charge in just under 2 hours from a near-empty state - if there's a charge on it already then it'll charge at roughly 1% every 2-3 minutes, maybe a touch more if the G2 is powered on and charging.
Either way, again, any modern charger will be fine. Try to get at least a 1A model from whoever, and avoid really cheap ones that can't do 1A minimum. If it's a brand name charger (Apple, Samsung, LG, Motorola, BlackBerry, etc) you'll be fine.
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Click to collapse
thank u for making it clear,
is there any way to measure output of any charger?
i know its not related here but just for fun.:laugh:
currently i am charging my G2 with 1A charger but it takes so long to reach 100% charge, may be about more than 4 hours.

Actually I meant 16a.... Just get a 2a charger and not a cheap one.. Expect to pay 20$

maydayind said:
Actually I meant 16a.... Just get a 2a charger and not a cheap one.. Expect to pay 20$
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hmm.. u are right.
one should go for original branded charger not chinese one..:laugh:

askfriends said:
hmm.. u are right.
one should go for original branded charger not chinese one..:laugh:
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Once I ordered a 2a charger from China.. Output was 200mah and it almost melted. 2$
U can measure how mouth the charger provide.
Easy way is to use a app in you phone. But not 100% accurate.
Hard and accurate way is to use a USB extender cable that u cut the + cable and use a ampere meter. But u have to use a high end cable for that and u don't want to cut a perfect god cable in half
So I recommend this app https://play.google.com/store/apps/details?id=com.manor.currentwidget

maydayind said:
Once I ordered a 2a charger from China.. Output was 200mah and it almost melted. 2$
U can measure how mouth the charger provide.
Easy way is to use a app in you phone. But not 100% accurate.
Hard and accurate way is to use a USB extender cable that u cut the + cable and use a ampere meter. But u have to use a high end cable for that and u don't want to cut a perfect god cable in half
So I recommend this app https://play.google.com/store/apps/details?id=com.manor.currentwidget
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Click to collapse
thank u so much for this tip, i am going to test it now..