This is an innovative intelligent 4-channel charger with automatic polarity detection and adjustable charging current. Allows you to charge lithium-ion batteries, lithium phosphate batteries, and nickel-metal hydride and nickel-cadmium batteries. abilityFour independent channels. Automatically detects battery polarity. Three charge current options: 500mA/1000mA/2000mA. Automatic detection of nickel-metal hydride and lithium-ion batteries. For LiFePO4 and 3.85V Li-Ion batteries, you must select the mode manually. Charge Ni-MH, NiCd: AA, AAA, C, SC batteries. Lithium ion, lithium iron phosphate: 18650, 17500, 18490, 18350, 17670, 16340 (RCR123), 14500, 10440. Digital displays the channel, battery type, battery voltage, cumulative capacity, charging time, and current. When the battery is fully charged, charging stops automatically. CHARGE mode with selectable charge current. Powered by a 5V/2A current source connected to the Micro USB connector. Activate a fully discharged battery. It is protected against short circuits, overcharges, and battery overheating and misinstallation. A defective battery is detected and "NULL" appears on the screen. LiitoKala Lii-S4 mode CHARGE mode