The SL-B26 8-Unit Bank Charger can recharge one Streamlight Li-Ion USB rechargeable battery pack in as little as 3.5 hours, or two battery packs in as little as 6.5 hours. The charger features dual input power sources, accepting either 5V USB power or 12VDC power. Dual input power sources provide a wide variety of battery pack charging options when a wall outlet is not available, such as a PC, power pack or 12VDC automotive power.