Unplug and turn off the base.
Remove the adjustable dumbbells and weights from the base.
Turn the base over and place the base in a position to access the underside without putting any pressure on the dial. If the dial is pressed, the base will power on. The battery replacement needs to be performed with the base powered off.
Use a Phillips screwdriver to remove the battery door screw from the bottom of the base.
Replace the battery by unplugging the connector and swapping the battery with an official Kabata certified battery.
Replace the battery door while avoiding pinching the wires. Screw the battery door shut.