High Quality lithium polymer battery pack, 14.8v / 1.6Ahr. 

Extend your ride with a spare battery, or punch out more laps in a 24hr race. With this extra battery and your exsiting battery, you will have 10hr runtime (med setting) and 5hr runtime (high setting). With the kLite quick charger, with 1hr charge time, your good for the whole 24hr race with only 1 extra battery.