Nitecore Intellicharger  i4 is a universal,automatic smart-charger compatible with almost all types of rechargeable batteries thus eliminating the need to own several chargers .the i4  able to automatically identify Li-ion,Ni-MH and Ni-CD rechargeable batteries and apply an appropriate charging mode(Constant charge Current(CC),Constant Charge Voltage(CV) and Trickle capable of monitoring and charging batteries  independently.Additionally, yellow and blue power/charging status indicator lights could visbly indicate battery status and charging process . i4 : the all-new highly advanced smart charger.it's as simple as insert,detect and charge.