Genuine Chord Mojo Battery. To open the Chord Mojo you need to unscrew 8 Torx-6 screws. Then, detach the simple 2 wire connector, replace with new battery, and screw back the rear Torx screws. You need to use some caution while prying the old battery loose. It is attached to the case with double sided tape.
[Please dispose the used battery correctly!]