Standard version battery box for small lithium-ion battery 757B21 - does not include 757Z186 locking lever. Color number 4.
The battery box is designed to accommodate a 757B21 small lithium-ion myo battery to provide electric power for the prosthesis.
Also available in a MyoBoy version (757191=2) which includes an external capped outlet for connection to MyoBoy device. This version also includes integrated screw connection for removing the battery box from the prosthesis.