The 18650 Button Top Li-Ion battery provides an alternate power source for Streamlight products that accept either standard CR123 lithium batteries or 18650 button top batteries. The two bay 18650 Button Top battery charger can recharge one 18650 battery in as little as 3.5 hours, or two batteries in as little as 6.5 hours. The charger features dual input power sources, accepting either 5V USB power included . Dual input power sources provide a wide variety of battery charging options when a wall outlet is not available, such as a PC, power pack or 12VDC automotive power. Includes 2 Batteries This kit only contains the USB Charger.