With regards to my woeful battery performance since iOS upgrade... I tried turning the screen brightness down to about 25%. I normally have it about 50-60% Yes it's a bit dull, but I noticed that the battery performance was WAY, WAY, WAY better. Went a full 18 hours before it got to 10%, and that was with calls, messages, runkeeper on for an hour. I was totally surprised. Anybody else care to try this to see if it makes a difference for you? I'm on a 4S with iOS6, but I suspect the same effect would happen with other models. .