The Nitecore UI2 2 bay USB-C li-ion battery charger is perfect for charging on-the-go and is compatible with a wide variety of batteries, including 20700 and 21700 cells. 

The UI2 automatically determines the optimal charging current when a battery is inserted; if below 2.9V the low current charging mode of 100mA will be activated or if over 2.9V the standard mode with a maximum charging current of 1000mA is adopted. 

Featuring a USB-C port, the UI2 is compatible with various power sources including, power banks, solar panels and USB adapters to ensure a continuous power supply.

The Nitecore UI2 has a simple display which indicates the charging status of each slot using three LEDs. The charger provides anti-short circuiting and reverse polarity protection, intelligent thermal protection and automatic termination upon charging completion, to keep your batteries in the best of health.

The charger is compatible with the following Li-ion/IMR batteries: 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500,17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650