Efest LUC V4 LCD 4 bay with USB-out Multi-function Smart Battery charger 4 spring-loaded, self adjusting battery bays for charging the following battery sizes: 10440 / 16340 / 14500 / 14650 / 17500 / 17670 / 18350 / 18490 / 18500 / 18650 / 18700 / 22650 / 26500 / 26650 Li-Mn or Li-ion battery. Advantages: 1. HD mini LCD screen displays precise voltage and battery capacity level. 2. Each charging channel has independent charging display status. 3. Automatically adjusts discharge current to charge different size battery. 4. Four kinds of protection: over-discharging, over-voltage, short-circuit and reverse polarity protection. 5. Automatically stops when full changed. DC wide voltage (12-24V). Specification: Input voltage: DC 12-24V Output voltage: 4.1 % 500mA CC current : > 450mA 1000mAh CC current: > 950mA Cut-off Voltage: 4.2V ± 0.05V TC Current, 0.5-1A: 60-120mA Auto recharging Threshold Value voltage: 3.9V ± 0.15mA Activation Voltage ( battery voltage < 2V): 0.45 ±0.15mA Operation Temperature: 0-40 Storage Temperature: -40 – +70°C Compatible batteries: 10440, 16340, 18350, 18500, 18650, 26650 and so on. Certification: CE, RoHs, UL.