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Technical Notes—Specifi cations
Wall plug
AC adapter plug
Power cable
Contact protector
Contacts
Quick Charger / Rechargeable Battery
The supplied MH-21 Quick Charger is for use with Nikon EN-EL4 and EN-EL4a
rechargeable Li-ion batteries. The MH-21 is equipped with battery calibra-
tion feature and charge lamps that glow, blink, or turn off according to the
battery charge state.
Charge lamps
Calibration lamp
Calibration button
Calibration
Calibration allows precise measurement of battery charge, ensuring that the battery
level can be displayed more accurately.
EN-EL4a Rechargeable Li-ion Batteries
EN-EL4a rechargeable Li-ion batteries can transmit information on battery state when
connected to compatible devices.