Whited00r question

I recently did a restore of a old iPhone 2nd gen with installing whited00r's custom iOS 4.2.1(8C148) then jailbroke it and unlocked it but now I'm having a problem with battery drainage if I use it it only last 2 hours and a bit if in stand by the battery stays good what can the problem be I don't know if it was the battery before I did this because it wouldn't even boot up it would stay on the apple screen and I could restore it in iTunes that's why I used whited00r any suggestion on why the battery is the way it is

I never used whited00r. I prefer to use Blackra1n on my iPhone 3G and I've had no battery issues. Try Blackra1n instead.