Me and my girlfriend both have the iPhone 4S. And I've noticed how much of a battery loss the 4S is getting compared to my old 4 that I'm still trying to sell. I have the 4 stock running on iOS 5 and even though it doesn't have Siri, it still is holding a lot more of a charge than my 4S, at least 10-15% more charge doing the same amount of use. My idea was perhaps swapping batteries between the 4 and 4S since Apple stated that the 4S has about 100 hrs less in standby mode and 100 hrs more in 3G talk, I really don't need that extra juice going towards 3G talk since I only turn it on when I need info on the go plus I have the 200 MB plan, and I have excellent signal strength on Edge where I live. Anyone think my theory will work?