I have 9A406 and basically there is no difference on battery life. It drains too quickly. I would charge it to the full, and within an hour or two, it goes down to 84% just by using it occasionally(not even youtube playing or dowloading). I basically have to charge my phone at least twice or more a day. (trust me I'm not a heavy user at all. i check email, playing with apps time to time, a couple call a day, that's it).
Of course, I turned off Siri, notification, email push, etc, to make the battery last long but doesn't seem helpful at all.
APPLE! WHEN ARE YOU GOING TO UPDATE A NEW IOS??
I had been an iphone 4 user, and it seems that 4S is worse. it is slower, battery drains quickly.
PLEASE DO SOMETHING ABOUT IT because it's already about a time to release iphone 5??