Make every journey fast, fun and easy with BionX's lightweight SL 350 Electric Motor Kit! This wonderful upgrade offers both a traditional throttle and power-assist technology along with a 65-mile range for the ideal balance of pedaling and power. With BionX's proportional assist, you just set the power level on the easy-to-use, backlit console and start pedaling. The harder you pedal, the more power the motor adds so you go faster and further with less effort. Or you can use the throttle for an instant burst of speed anytime. And, when the time comes to head downhill, BionX's regenerative braking uses the motor to help slow you down while recharging the battery for a sweet energy-efficient bonus! 6.6 Ah battery