The MD-4 lets you shoot up to 140 rolls of 36-exp. film on one set of eight 1.5V LR6 (AA-size alkaline) batteries. All camera functions are powered by the motor drive. And by using the cold-resistant and NiCd Battery Unit, you can even take pictures down to -20(deg).

MD-4 Specifications
Firing rate: Approx. 6 fps with NiCd Battery Unit MN-2, approx. 4 fps with 8 AA-size batteries (at 1/125s shutter speed or faster)
Shooting modes: Single-frame (S); COntinuous (C)
Remote control: Possible; uses standard Nikon 2-pin connector
Power source: Eight 1.5V LR6 (AA-size alkaline), 1.2 KR-AA (AA-size NiCd) or 1.5V R6 (AA-size manganese) batteries (intergral battery holder)