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The NIKON D1X Battery was shipped with NIKON EN-4 Battery. NIKON EN-4 Battery Batteries Specifications:
Battery Name : NIKON EN-4 BatteryBattery Type : Ni-MH  Capacity : 2100 mAh Voltage : 7.2 V Size : 121.95x61.40x39.15 mm Color : black Repair or replace during the first 90 days. 1 Year Warranty. 30 Days Money Back.
NIKON EN-4  Fit Models List
DDEN4EN-4D1D1HD1X
Battery more use information:Battery Chemistries:
The mention of NiMH on a battery pack does not automatically guarantee high energy density. A prismatic NiMH battery for a mobile phone, for example, is made for slim geometry and may only have an energy density of 60Wh/kg. The cycle count for this battery would be limited to around 300. In comparison, a cylindrical NiMH offers energy densities of 80Wh/kg and higher. Still, the cycle count of this battery will be moderate to low. High durability NiMH batteries, which are intended for industrial use and the electric vehicle enduring 1000 discharges to 80 percent depth-of discharge, are packaged in large cylindrical cells. The energy density on these cells is a modest 70Wh/kg.
more info:http://www.abatteryweb.com/digital-camera-battery/nikon-37.html