Mitsubishi MR-JE-10B Instruction Manual page 237

11. OPTIONS AND PERIPHERAL EQUIPMENT
For MR-JE-200B or more, connect the battery cable as follows.
(b) Removal procedure
CAUTION
Pulling out the connector of the battery without the lock release lever pressed
may damage the CN4 connector of the servo amplifier or the connector of the
battery.
11 - 24
Install a battery, and route the battery cable along
the right side of the battery.
When connecting the encoder cable to CN2 connector,
prevent the battery cable from being pinched.
Install a battery, and connect the plug to the CN4 connector.
While pressing the lock release lever,
pull out the connector.
Pull the lock release lever to push up
the battery.