how many bars is your signal usually? 50% seems like a lot for cell standby to be using unless your signal isn't very good where your at. when cell service isn't that strong it drains the battery a lot quicker. phone idle also seems high for some reason like some app is always running when the screen is off.
either way tho a new battery probably wouldn't hurt.
I restarted the phone and looked at running services/apps
settings
android core apps
maps (WHY????)
adw launcher
android weather (app i installed)
just pictures (app i installed because i didn't find gallery on the rom)
lotus tarveler
update device
google services
ics keyboard
google play store