This is the battery for the Chasing M2 PRO underwater rover.

The Chasing M2 PRO originally comes with a standard battery of 300Wh

You can choose a high capacity battery of 300Wh or 700Wh to improve the dive times significantly.

Compatible with CHASING M2 PRO or M2 Pro MAX

The large-capacity lithium battery of Chasing M2 PRO is removable and can be charged independently. Multiple batteries are used by turns, which can greatly extend underwater working time.