Casio G'zOne Rock User Manual page 23

3.
Slide the battery into the slot by aligning the
contacts and tabs
you hear the "click".
4.
Insert the battery cover tabs into the slots
and press the battery cover in the direction of
the arrow
5.
Press down firmly on the side of the battery
cover at each arrow point, as shown to the
right.
6.
Insert the tip of the corner of the Device Lock
Tool into the groove of the screw type battery
lock and rotate in the direction indicated
Rotate the battery lock as far as it will go
towards the LOCK position.
22
and press down
.
until
.