This portable charger can intelligently fast charge a rechargeable Li-Ion cell from a USB power source - no mains power required. The charger automatically detects the battery and sets a 500mA or 1000mA current to fast charge the battery accordingly. The spring-loaded cradle supports 26650, 26500, 22650, 18650, 18490, 17670, 17335, 16340 (RCR123A), 14500, and 10440. Features zero voltage battery activation for protected cells, as well as short-circuit, reverse-polarity, and bad battery detection. Includes USB-C power cable.