Iphone 3g with Exchange Activesync lackluster battery life

Hey fellow IPhone people!
I just bought my first Iphone and just returned my first Blackberry Storm in favor of the IPhone's superior UI.
I use Exchange Activesync to synchronize my company email/contacts/calendar with my IPhone. It seems to work well, however, I have noticed that it checks for new mail about every 5 or so seconds while I am in the mail application.
I have the settings set to manual and push for the Fetch of mail, however, it still seems to check for mail every 5-10 seconds.
Given this the battery life is terrible. By mid day my battery is more than half gone and I charge it fully each evening.
Has anyone else experienced this who is actively running Exchange Activesync?
Can this be a settings issue on either the IPhone or on Exchange?
Please advise if you have specific experience with this.
I think either I have a faulty iPhone battery or ??
Thanks !

There's something stuck in the Calendar sync...! You can check your phone's usage in the Setting-->General-->Usage... You will find the usage is abnormal high once you turn on Calendar sync with exchange. I have the same problem...2.1 didn't fix it. Now, the only thing I can do is turn on Calendar sync. But Contact and Email works fine. I found out this problem when I was doing a international travel...There's non-stop international data roaming communication between iPhone and Exchange which transmitted 100MB data in a morning, cost me US$2,000 !!!

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I tried turning off iCloud contacts sync, I tried recreate my Exchange account. I tried a complete reinstall.
After that I could do a full sync on Sunday.
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- also in Contacts on the iPhone I have a new group that has been created with the name of my Exchange account. The group appears to be blank when you go into it on the phone, but you can type in the search box and get contact details from the server just fine.
This seems workable for now for my purposes, although updating contacts is not going to be possible that way.
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- Is it really true that I have to choose between syncing Exchange with work server OR syncing iCal with personal Macbook?
- What is the best work around for this?
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