About Product:External charger Power: 15 v switch: four keys. The discharge time: 3.5 hours, a full charge of high-grade discharge intermediate discharge six hours, high-grade discharge more than 9 hours. Charging time: Alternating current (ac)/solar (sunny) rechargeable 'full 8 hours by the red light turns green. The Issues: Such as winter don't use a full battery fan first, and then unplug the battery chassiline socket, so to better battery life is longer. Power cord: wire /PVC wire