I'm using Myn's2.2 with Kings#11 with SetCPU, Oced to 1.19max, 998min on performance with screen on. 384max 245min conservative, screen off.
I do not have battery tweak since it does not play nice with SetCPU.
With this setup I've been averaging 19-20 hours with normal usage ( 5-6 calls 5-10 min each, 25 texts, 1 - 1.50 hours of internet ).
Heavy usage involves playing some games (Angry Birds

) and using 4g will bring it down alot faster.
I also did the battery stat wipe to help it out.
So far with this setup, I'm
NOT experiencing any lag or reboots, and to me excellent battery life.