PureHitech Xtreme Portable Energy Pak. Battery technology: Lithium Polymer (LiPo), Battery voltage: 18 V, Output current: 3.5 A. Weight: 0.425 kg. Operating temperature range (T-T): 0 - 45 °C. Dimensions (WxDxH): 181 x 110 x 20 mm, Input voltage: DC 18 V