Hello, I had my iPhone for a long time now, but a week ago my battery started to go downhill, badly. I decided to go on Google, trying to fix this. Unfortunatly, nothing really worked. My battery life is like 4 hours standby. I overcharge my phone many times too, don't know if that's the problem? Most of the times it charges up to 7 hours at once (I leave it on the charger at night). Can somebody help with this problem please? iPhone 4 running on iOS 7.1.2 Thank you in advance!