Vello BG-S3 User Manual page 7

4.
To prevent loss, place the battery chamber door
into the BG-S3 battery door compartment.
Align the door with the BG-S3's battery door
compartment, and then insert the door. Press
the door's release button to lock the door in
place.
5.
Swing the door shut and slide the switch to the
LOCK position.
7