It is not possible to replace a battery in an older version of either the DuraScan D600 or D700 series reader. If your DuraScan D600 or D700 series is the later v21 version, please follow the instructions below. Remove Battery Door Use screw driver to loosen screw and remove battery door. Remove Battery Use a flat head screw driver and place in the top right corner to gently push the battery out. Then, pull the connector to remove. Insert New Battery Plug the connector on the new battery.  Secure Battery Door Ensure the battery door is properly placed, then screw the battery door back on.