Changing the battery
Changing Monarch 6039 Battery
Step 1. Press the button on the battery compartment door (at the bottom of the scanner’s handle) and slide it open (the door stays attached).
Step 2. Insert a new battery into the compartment.
Step 3. Slide the compartment door shut. You have to press the battery in slightly so the door fits over it. When the door shuts, you should hear it click into place.