The Nitecore Intellicharge i4 is a universal, automatic smart-charger that is compatible with almost all types of rechargeable batteries. The i4 is able to automatically idenfity Li-ion, Ni-MH and Ni-Cd rechargeable batteries and apply the appropriate charging mode. Each of the four microcomputer-controlled charging slots is capable of monitoring and charging batteries independently. In addition, yellow and blue power/charging status indicator lights indicate the battery status and charging process. Note: Compatible with Li-ion (26650, 22650, 18650, 17670, 18490, 17500, 18350, 16340, 14500, 10440), Ni-MH and Ni-Cd (AA, AAA, AAAA, C) rechargeable batteries.