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So if you dont want your battery to be drain again, you need to prevent the ActiveSync from waking up the device every five minutes. To do this read the lines below and follow the instructions:
1. Start ActiveSync on your Pocket PC.
2. Tap "Menu", then "Add Server Source"
3. Configure a server source with a fake IP address, id and password - you can enter anything you like, it doesn't matter
4. After that you will notice that "Menu -> Schedule..." item is no longer greyed out.
5. Change your schedule to manual under both fields.
6. You can now delete your fake server - your changes to the schedule will remain in effect. ActiveSync will no longer be able to drain your battery.
Try this, this is what I did to stop it coming on. Worked for me and my battery is awesome now. Hope that helps.