mobile me calendar + push

All push services will drain the battery in a cumulative fashion. I have my Mobileme calendar updates set for manual and it works well. When you open the calendar app on the iPhone, it will contact Mobileme and download any changes made to your iCal calendar either on your computer, or on the web through Mobileme. You'll see the little internet activity icon next to the wifi/edge/3g icon in the menu bar on the phone. If you change or add an event on the phone, it will upload the information to Mobileme immediately so it will be reflected on your computer the next time the sync to your computer occurs. My battery life increased dramatically after I turned off the push services.