Ok, i'm rather amazed on my battery right now, its been 20 hours since I have recharged my iPhone 4S 16GB, I've done a few emails, a few SMSs, and even played a game for 20 minutes (fill in time), and the remainder on stand-by and my battery has dropped to only 93% - by now I would be under 50%. I don't know if it was 5.0.1 or that I reinstalled the iOS a few days ago.