BP uses empty housing number 10134001 Battery Pack for VFI 2000/3000 RMG (12x9Ah, 72VDC). Includes 2 strings of 6 batteries, each 12V/9Ah capacity. Battery pack operates on 72VDC nominal voltage. Dimensions are H:88mm x W:438mm x D:600mm. Weight: 40,8kg.