The LiitoKala Lii-S2 battery charger is suitable for charging Li-ion, NiMH, LiFePO4, and IMR batteries of sizes 10440, 14500, 16340 (RCR123), 17500, 17700, 18490, 18650, 20700, and 26650. The model design includes 2 battery slots. Protective technologies prevent short circuit and reverse polarity risks. \nThe LiitoKala Lii-S2 features movable contacts that allow charging batteries of any size. The display shows charge status and operational health information. A timer automatically turns off the charger after the set time expires. An audible signal alerts you when charging is complete.