I am currently running iOS 5.0.1 on an iphone 4s. I am wondering if I should upgrade to iOS 5.1? My only problem right now is the horrible battery life; it lasts only a day and loses 20-25% overnight sitting on the side. I really loved the battery life of the iphone 4 which lasted me 3 days and this 4s hardly pulls off a day. Any tips/advice would be greatly appreciated.