The battery life of the phone is significantly lower then expected. This can occur because of a conflict with the sync settings of an Exchange email account setup on the phone and the Exchange server settings.
If the sync schedule during the Exchange account setup on the phone conflicts or differs from the Exchange server settings, the Email app on the phone will override any existing schedules and will attempt to sync constantly. This drains the battery.
To fix poor battery performance due to the Exchange email sync, follow these steps:
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