I'm on 2.3.4 stock w/ stock CWMed 18.104.22.168 kernel and its THE best battery life I've gotten compared to ALL custom roms and kernels, period.
I use my sammy as a tablet, so occasional half hour of a game or checking some online apps, wifi being off in between, and so far I've 27:50:xx up time w/ 39% battery left. It loses if 1% overnight in pretty much standby w/ everything power-draining off.
Oh, what's this? A blog? Wanna click? Click it! Do it!!
Nokia E6 to do WERK, Galaxy S2 to fool around.