265Technical Notes—SpecificationsWall plugAC adapter plugPower cableContact protectorContactsQuick Charger / Rechargeable BatteryThe supplied MH-21 Quick Charger is for use with Nikon EN-EL4 and EN-EL4arechargeable Li-ion batteries. The MH-21 is equipped with battery calibra-tion feature and charge lamps that glow, blink, or turn off according to thebattery charge state.Charge lampsCalibration lampCalibration buttonCalibrationCalibration allows precise measurement of battery charge, ensuring that the batterylevel can be displayed more accurately.EN-EL4a Rechargeable Li-ion BatteriesEN-EL4a rechargeable Li-ion batteries can transmit information on battery state whenconnected to compatible devices.
