Traveling to places where mains power is not available? No Problem! You can charge your Pilot-12 CPAP Battery from your vehicle's 12V cigarette lighter adaptor! Easy to use: plug one end of the Medistrom™ Car Charger into the car cigarette lighter socket, and the other end into the "CHARGE" jack of your Pilot-12 CPAP Battery. The battery will charge in 3-4 hours.