18 Amp Hour Nickel Metal Hydride Battery Pack Voltage: 13.2 VDC Capacity: 18 AH Dimensions: 3.75" D x 13.25" L / 9.5cm x 33.7cm Buoyancy: -3 lbs / -1.4kg Material: Acrylic Burn Time (with HID-10MR): 17 hours