This Lithium-ion Battery (22.2V, 28Ah), fondly known amongst our team as the MEGA BATTERY, is designed for use in subsea vehicles powered by the T500 Thruster. It fits in our 4″ Series watertight enclosures and has enough power output and capacity for serious ROVs, USVs, and other vehicles! It has a QS8-S connector as well as an adapter for XT90S connections. Not compatible with the BlueROV2!