The charger is DC input digital battery charger, input part use DC-DC special power supply IC, output part use OP-Amp IC to control. It can charge arbitrary capacity digital li-ion battery of 3.6V/3.7V/7.2V/7.4V.
Charge control mode: voltage control, current control.
a. plug in, no battery charge, green lamp long-light after light flash between red and green.
b. normal charging with li-ion battery, LED red light flash, full- charged, switch to trickle charging stage, LED charge lamp translate green light.
Moveable battery compartment makes it possible to chooseproper battery compartments in accordance with battery models.
Photoolex Smart Charger BC01-ENEL3E for Nikon EN-EL3e Battery