I have only one MobileMe email account, and currently it is set to Push. Long battery life is important to me, so should I turn off push? I would also like to keep notifications from applications active. How often should I fetch to maintain a decent battery life? My workday starts at 8AM, and the battery in any iPhone I had ever lasted me past 4PM. I use my iPhone heavily, for everything. It is my primary email and Internet device.