31.2Amp Hour Lithium Ion Battery Pack and charger Voltage: 11.1 VDC Capacity: 31.2 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): 24 hours