Hi,the battery is definately bad for it to be running down so fast,i will advice you don't disable the GPS,i will rather advice you to get a new battery and try to adhere to the following terms below. 1.do not make use of the mobile phone while the phone is on charge,either browsing or receiving calls is prohibited and also dangerous to once health.2.make sure the battery gets to a bar or two on the battery bar before you attempt charging.thanks