Hyperion G3 Cx 0550 Mah 2s 7.4v 25c/45c Pack Battery Pack Dimensions: 64.2 mm x 18.2 mm x 14.5 mm Battery Pack Weight 32.5 g/1.15 oz. Specs At A Glance: Battery Voltage: 7.4 V; Battery Capacity: 550 mah; Battery Dishcarge Wire Size: 20 awg; Battery Balance Connector: Yes ;Battery Discharge Wire Length: 80 mm Connector: JST Suggested Accessories: Hyperion EOS 0606i DC Charger, Hyperion EOS 0606i AC/DC Charger, Hyperion EOS 0615 Duo Charger, or Hyperion EOS 0720i AC/DC Charger, HP-UM6PADAPT (charge 6 U type packs at once using this parallel adapter plug)