It sounds more like something else is going on. I'm on FB's build also, w/ the same modem and kernel but my battery lasts just fine. So it isn't the rom or the kernel.
Sent from my SGH-T959V using xda premium
DEVICE: SGH-T999 (T-Mobile Galaxy SIII)
ROM: CM 10.2 Nightly
DEVICE: [retired] SGH-T959V (T-Mobile Galaxy S 4G)
ROM: ICS - AOKP Milestone 6
DEVICE: Nexus 7
ROM: CM 10.1 nightly...