Unlock the battery cover. Slide the switch to the FREE position.
Remove the battery cover. Insert your finger into the groove (1) and pull up on the back cover in the direction of the arrow (2). When the back cover is loose, pull it in the direction of the arrow (3).
Slide the battery into the device. Align the battery contacts with the connectors in the battery compartment (1) and press down (2) until it fits firmly in place.
Slide the battery lock to the left or LOCK position.
Insert the battery cover tabs into the slots (1) and press the back cover down (2).
Press down hard on all sides of the battery cover.
Lock the battery cover. Slide the switch to the LOCK position.