I haven't had good battery life on any of the gingerbread ROMs I've tried. I think it's because the devs don't have a Thunderbolt Gingerbread kernel to work with yet, and have pieced together their own. I'm back on das BAMF 1.8 now, and enjoying the great toolbox and battery life at the same time. The only thing I really miss is the weather and shortcuts on the lock screen.