Mitsubishi Electric MELSERVO-J4 Series Transition Handbook page 642

Part 9: Review on Replacement of Optional Peripheral Equipment
(3) Battery mounting
(a) When using 1-axis servo amplifier
(b) When using up to 8-axis servo amplifiers
POINT
One battery unit can be connected to up to 8-axis servo motors. Servo motors in
the incremental system are included as the axis Nos.
The MR-J4W_-_B servo amplifiers can be combined with MR-J4-_B_(-RJ) servo
amplifiers.
Servo amplifier
CN1A
CN1B
CN4
MR-BT6VCASE
CN10
MR-BT6V1CBL_M
Servo amplifier
(First)
CN4
MR-BT6VCASE
CN10
MR-BT6V1CBL_M
Cap
Servo amplifier
(Second)
CN4
MR-BT6V2CBL_M
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Servo amplifier
(Last)
CN4
MR-BT6V2CBL_M