I've owned three iPhone but still on the iPhone 4. I've never had any battery issues, always make me smile when people moan about the dreadful 4s issues. Boy was my smile wiped off my face when I woke up to a flat phone which was 100% charged last night. So what did I do to be greeted with one dead phone. Turned push email on with one email account and set it to 30 minute intervals. I know it says set it to longer intervals to save battery but jehesus I wasn't expecting it to use that much juice lol.