There must be something wrong. I am getting terrible battery life with iOS 5. I am running beta 4 now and it still terrible. On standby, my phone drops about 1% in 15-20 min, with iCloud on and off. I made a test yesterday and turn the airplane mode on. The battery didn't moved 1% in 4 hours !! In the first hour that I turned airplane mode off again, it dropped 3%. I tried everything: iCloud on and off, locations on and off, push on and off. None made it better. I hope for this to get fixed soon !