I am using Exchange for Mail and MobileMe for contacts and calendars. If I set my Exchange account to push, my battery drains in ~4 hours. If I check my usage under settings, the "usage" time is the same as the amount of time that has past since turning on exchange push services. Changing the exchange account sync settings to manual fixes the battery drain problem. I am not having the same problem with MobileMe push services. Is anyone else experiencing this. More importantly, has anyone managed to fix this?