D Size Ni-MH Rechargeable Battery Capacity: 4500mAh, 6500mAh, 8000mAh, 8500mAh, 9000mAh Nominal Voltage: 1.2 V Nominal charging time: 14 hours Fast charging time: 1.2 hours (4500, 6000mAh), 2.4 hours(8000, 8500, 9000mAh) Diameter: About 32.5mm Height: About 60mm Other size and capacity can be made according to your needs.