The Nitecore UNK2 charger can charge two batteries simultaneously, with each slot having a maximum output current of 1000 mA. When charging two batteries, the device automatically adjusts the output current to achieve an optimal charge setting based on the available input amperage. It is therefore not guaranteed that both batteries will be charged at the same time with the full output of 1000 mA, as the total output depends on the input power supply.

According to the manufacturer's data, the following batteries are supported: EN-EL15, EN-EL15a and EN-EL15b. Unfortunately, your battery is not supported.