Anybody getting bad battery life on the iPhone 4s? Before I exchanged for a replacement iPhone, I was getting at least 8 hours usage. After the replacement I have been getting around 5~ I tried restoring my iPhone as well as putting it in DFU mode to restore but same problem. I downloaded BatteryInfo from Cydia and it tells me battery is still new! Currently my iPhone only has 20 charge cycles so I don't understand why I'm only getting 5~ usage instead of 8.