Lenmar Replacement Battery for Nikon D1 Set D1H Set D1X Set Replaces OEM Nikon EN-4 Polaroid PR-114DG Fits: Nikon D1 Set, D1H Set, D1X Set Replaces: Nikon EN-4, Polaroid PR-114DG 7.2V / 2100mAh Nickel-Metal Hydride 2 Year Warranty Replaces Nikon EN-4 Fits Nikon D1X Set, D1 Set, D1H Set (See Product Description for Additional Fits) 7.2 Volts, 2100mAh Capacity Nickel-Metal Hydride 3 Year Warranty