Mitsubishi Electric MELSERVO-J4 MR-J4 TM Instruction Manual page 347

11. OPTIONS AND PERIPHERAL EQUIPMENT
(4) Replacement procedure of the built-in battery
When the MR-BAT6V1SET-A reaches the end of its life, replace the MR-BAT6V1 battery in the MR-
BAT6V1SET-A.
Cover
Projection
(four places)
While pressing the locking part, open the cover.
Tab
Replace the battery with a new MR-BAT6V1 battery.
Press the cover until it is fixed with the projection of the
locking part to close the cover.
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