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"Tweak Microsoft Exchange. If you're connected to a Microsoft Exchange server for corporate email, calendar and contact sync, you may experience an abnormal amount of battery drain on your Android smartphone. When connected to PC Mag's Exchange server, battery life was great on Android 2.1, but when upgraded to 2.2, phones experienced a significant drop in battery life. Reducing the size of the email folder to below 150 MB solved this issue. View your folder size in Outlook by right-clicking on your Inbox, then choosing Properties > General > Folder Size. Either archive or delete emails until the folder size is below 150 MB. "