Seems a bit high, can you show the system's "battery" screen, so I can know what I'm looking at?
The most common reasons for high battery use are:
- Too many folders in IMAP push mode (above 1-2-3), especially Gmail accounts
- Too high "messages per page" settings, which is how many recent messages the app looks at every time it checks mail or catches up to push. The default is 25 (same as K9, Mail Droid, and stock Email, but the setting goes up to 1000, IIRC).
- With push off, very frequent mail check schedule
Several of these combined can be especially deadly.