its true! i also had this problem last night. charging from 6pm until 6am to get full 100% charge. what the heck. Strange though as many of us experience this problem almost at the same time.

I have read around internet i found that this is probably due to jelly bean upgrade (never had this problem in ICS). Some even log the case to android developer as bugs, but android team points it to Samsung as its their phone software. I called Samsung service centre and they suspect its the charger/USB cable/phone USB port faulty. But i still think its software issue because my S3 is just less a month old.


This is what i found, please update if any of you found a fix to this. Thanks.

What are the reason the Galaxy S3 battery takes too long to charge?

The following reasons why this happen are not applicable to all users but they have seemed to be the reason in most cases.

•It is said that if you don’t update your phone with 100% battery and you update it with little battery, then the phone remembers that as being fully charged at a lower percentage. This is what some experts say, but it may not be 100% true.
•Also, another bug in the Jelly Bean software is that it doesn’t recognize the charger as being an AC charger but as being an USB charger because of the two piece charge formed by the USB cable and the AC adapter.
•There is a bug in the Jelly Bean software

•SOLUTIONS: You need to use a charger formed of only one piece, not the USB + adapter charger. Also use only Samsung chargers. If you have a Galaxy S2 charger you can try that one.
•Do a complete re calibration of the battery. This means drain the battery completely to 0% and then charge it overnight with the phone turned off. Do this 2 times.
•This problem may not be a permanent one and sometimes after charging the Galaxy S3 a few times it optimizes itself and re calibrates the battery to normal. So try a few charges before thinking this is a permanent issue.
•Another solution is to install CWM Recovery and go to ‘advanced’ > ‘wipe battery stats’.
If none of these solutions work for you you should try to use other batteries to see if they act the same. This will tell you if the problem is with the phone or with the battery. If it’s indeed the battery then you should consider replacing it or switching it at warranty.