In my opinion, this is normal. Sense roms tend to eat battery power. Assuming your battery is good, things may be running in the background, resident, but not actually doing anything. You can try juice defender and see if that helps, you can use a scheduled task killer, and try disabling things like auto sync and things that don't need to be on when your phone is idle. Just some thoughts. Hope it helps. Like I said, sense rom's tend to chew battery power. I tend to stick with asop, personally. I get better life (e.g. I am using jelly blur. Phone has been off charge 12 hours. I've used 29% battery).
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