There is some confusion about which battery fits which Nikon camera and which charger you should use when considering the Nikon EN-EL3 (also supplied as the EN-ENL3a and Nikon EN-EL3e. This is not surprising as both batteries look pretty much the same, dimensionally at least. They’re both also Li-ion 7.4V 1400mAh. The real difference is the Nikon EN-EL3e has three contacts while the Nikon EN-EL3/EN-EL3a has just two.
The third contact on the EN-EL3e battery sits in the middle of the two contacts found on the EN-EL3. This third contact was added to provide additional information for Nikon’s D200 Digital SLR. The battery will however fit and work in older cameras. But the older two contact EN-EL3 battery will not go fully into the more modern three contact cameras as the camera’s third internal contact will prevent the battery from slipping all the way into the housing.
When it comes to the battery charger the MH-18 / MH-18a will charge both the EN-EH3 and the EN-EH3e batteries
Cameras that take the EN-EL3e battery
Nikon D50
Nikon D70
Nikon D70s
Nikon D80
Nikon D90
Nikon D100
Nikon D200
Nikon D300
Nikon D300S
Nikon D700
Cameras that take the EN-EL3 / EN-EL3a battery
Nikon D50
Nikon D70
Nikon D70s
Nikon D100
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