The B2 battery is specifically designed for the new Bomb Moto B2 chassis & motor. It's the perfect battery source for the B2's QS120 V3 special edition motor, fits perfectly into the B2 chassis battery tray and brace, and boasts 72V, 36ah and 150a constant/240a peak. The B2 chassis offers plenty of room for clean wiring installations and additional components. With a recommended max tune of 125-150 amp constant, be prepared to feel pure torque and big acceleration and great range with the lightweight B2 chassis.