USB powered with a charging current of 750mA. Compatible with lithium batteries with a rated voltage between 3.6V and 3.7V. NiMH batteries. There is no need for matching the polarities, as the charger can automatically recognize them when in use. All sizes compatible. It works perfectly on cylinder shaped batteries of variable diameters and lengths. Tangle-free flat cable design. Easy for storing and organizing.
*To prevent a short circuit, DO NOT charge batteries with a positive AND negative polarity on the same side. This includes Olight customized batteries built for magnetic charging.