If I may ask, is your battery life that bad that you need to do that? Between videos, surfing, and GPS I still get 16 hours of battery life minimum.
Samsung Galaxy S® 4 MJA Rooted with CF Auto-Root Tutorial
HTC EVO Design 4G™ v4.0.3 Bootloader Unlocked & Rooted with HTC SuperTool v3
If it ain't broke, use a sledge hammer.