Set the battery compartment lock (7) to the far right position .
Open the battery compartment cover (11).
Insert the APS 5T battery (9) under the battery compartment cover (11) as shown in the image. The protrusion (A) on the battery should fit into the groove between the fasteners under the battery compartment cover (11).
Close the battery compartment cover (11). The hook (10) must fit into the groove of the battery compartment cover lock (7). Then move the lock (7) to the left as far as it will go into the fixed position until it clicks. The lug on the lock (7) must line up with the icon .