Nitecore i8 Multi-slot Intelligent Charger, monitors and charges each of the 8 slots independently, automatically detects power level of batteries and selects the appropriate voltage and charging mode.It has overtime protection.It will individually monitor the elapsed charging time for each battery slot and if a particular slot exceeds 20 hours.The I8 will automatically stop charging and the green power indicators will illumiate to indicate completion of the charging process.This feature reduces the risk caused by batteries of lesser quality. Capable of charging 8 batteries simultaneously Active Current Distribution(ACD) Monitir and charges each of 8 slots independently Compatible with and identifiies Li-ion batteries.Ni-MH and Ni-Cd rechargeable batteries features three Charging modes (Contant current,constant voltage,-dV/dt) Automatically detects power level of batteries and selects the approprite voltage and charging mode Automatically stops upon charging completion Over charging prevention Reverse polarity protection and short circuit protection Activation fuction for over discharged protected batteries USB output, Compatible with USB Devices Desgned for optional heat disspation Made from durable PC material (fire retardant/flame resistant) Certified by RoHS,CE,FCC,CEC Work with 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14350, 14430, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 22500, 22650, 25500, 26500, 26650