Battery turn off at 30 % charge
I just bought a Iphone 3gs and my Problem is that if the battery reaches a level around 30% , the phone just turns off . The only way to get it back running is to charge it up , so that is has more then 30%. Can you tell me how to fix the problem please ?? fyi i dont have the phone jailbreaked or anything , i just bought it on ebay und received it reseted without any programs on it.