Introduction
The Nikon EN-4 battery was used in the D1-series
DSLRs prior to their replacement with the D2-series. Offered for the original
D1, they were also carried forward to work with the
D1H and
D1X models that came out afterwards. When the D2-series was released, it also added a new Lithium-Ion battery system that eventually replaced the EN-4 line.

Nikon EN-4 battery cartridge used by the D1-series.
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Specifications - Battery Type: Nickel Metal Hydride (6-cell).
- Capacity: 2000mAh
- Charger: Nikon MH-16.
- Dimensions: 120x61x40mm.
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See Also - Nikon D1 - Original Nikon DSLR to make use of the EN-4 battery cartridge.
- Nikon D1H - Successor to the D1 that continued using this battery system.
- Nikon D1X - Studio-oriented cousin of the D1H.
- EN-EL4 - Lithium-Ion batteries used in the D2-series.
- EN-EL4A - Higher capacity variant of the EN-EL4 battery.