The EN-EL14 is a rechargeable Li-ion battery that powers select Nikon D-SLR cameras, providing 7.2v and 1230 mAh of power.
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Used together with your Nikon D SLR, the camera’s fuel gauge accurately displays the remaining charge and number of shots since the last charging
The battery uses the MH 24 charger
The EN EL4a even gives notice when calibration is necessary