C H A P T E R 1U N I T E C H P A 6 0 0W I N D O W S M O B I L E V E R S I O NO V E R V I E W A N D S E T U P9NOTE: To enable the internal battery cell to provide backup power supply,charge your device with the main battery pack for at least 16 hours.1. Open the battery compartment by pushing the latch in the direction of the arrowand lifting up.The battery compartment is displayed:NOTE: The plastic battery tab makes it easy to remove the battery.2. Locate the backup battery switch and turn it on.3. Position the battery pack, making sure the battery contacts are aligned with thecontacts in the compartment and the battery is placed on top of the plastic tab, asshown in the following illustration.4. Slide the battery pack into the battery bay while simultaneously pulling the batteryhook until the battery clicks into place.5. Replace the battery compartment cover.