I seriously doubt that checking email is what is running your battery down, unless you are constantly receiving something, and BIS does not check every 5 to 10 seconds as you suggest.
RIM polls your email servers every 15 minutes and pushes mail that is found to your device. Then it checks again in 2- 3 minutes and if mail is found, that is pushed and a repoll occurs in another 2-3 minutes. This cycle continues until no mail is found, at which time the cycle reverts to a 15 minute poll and everything begins again.
My guess is there are things running in the background that is draining the battery. What apps are you using? Facebook? Twitter? Youtube? Are you surfing a lot?
In any case, you should close each app as you finish with it, not just exit out.
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