Canon 814XL-S - Manual (Page 21)

To load the batteries:
1. Using a coin or some similar object, rotate the
battery chamber cover lock at the end of the
grip to "OPEN".
2. Load six new batteries into the grip so that
their poles are facing in the directions in­
dicated by the diagram on the side of the grip.
If the poles are not in the correct directions,
reverse current may lead to battery rupture.
3. Align the positioning pins on the rear of the
battery chamber cover with the correspond­
ing holes at the end of the grip, push the cover
in and rotate the cover lock to CLOSE. The
cover cannot be closed if you try to attach it in
the wrong direction.
Main Switch
The main switch controls the power for all
camera systems. For filming, recording, checking
the exposure, power zooming or doing anything
else that requires power, the main switch must
be set to "ON". When not using the camera,
be sure the main switch is "OFF" to prevent
battery drain. A red warning appears when the
switch is at the "ON" position to remind you that
you are using power.