Double the juice, triple the pleasure. You can equip your bike with not just one, but two batteries. To do so you’ll need to install the DualBattery set and obtain a second battery separately. This set-up will give you twice the range and guarantee you more staying power. The price of an extra battery depends on the type that fits your bike. On average, the price is around $420. Inquire with your local dealer for specific information on which battery you need.