1yippy1:Pwned: The battery life on my iPhone 4 is shorter on iOS6, I used to get at least 2 days on 5.1.1 but after the update last night the battery only lasted a few hours and it's drained when I woke up this morning. Wish I never updated to this version. Oh Apple...
To fix fast draining battery click settings , general , cellular , scroll down to "use cellular for: turn all off.
battery life should be better than ios5 :)
I have noticed that battery life has been worse on my ipad 2 since ios6, and I always have cellular and wifi off unless I am needing it. The 3d maps also uses a lot of battery power.