Toshiba ER6VC119A batteries are available to buy online today. Shipping till 4.30PM GMT. This battery includes the 2 pin black connector for Mitsubishi MR-J3BAT for Melservo MR-J3. These 3.6 volt batteries are fitted on a multitude of different CNC, PLC and robotic applications with different connectors. Make sure the connector on your battery is correct to the picture here.
This 3.6 volt battery is rated at 2400mAh (milli amp hours) with dimensions of 52mm * 19mm (includes 11cm cable ready for to be packed). The MR-J3BAT has absolute positioning.