Nitecore UM2 A 2-slot charger and USB smart charging with a maximum total output of 3000 mA (1500mAh per slot) and a maximum single-slot output of 1500 mA, capable of charging two batteries simultaneously and controlling each slot independently. The UM2 incorporates an optimized IMR battery charging program, capable of monitoring the entire charging process, ensuring that the cut-off voltage is always within safe limits to extend battery life.