lol not sure but somehow i feel that the rom suits according to the original hardware aspects ... every rom isnt for everybody... to be frank i used almost all the roms .... max to max i used to get 24 hrs backup... to be frank on barebones now its 36 hours running on standby.... havent used it much ..... but although with the same usage i barely used to get around 24-30 hours .....Wow! BB Froyo 157 gave me 12 hours of life from 100%-0% I can't believe how all of you get so much battery life! I'm back on WIUI and I get 18 hours from full to zero now.