2LP703048P4HHR: 7.4 volt 850mAh rechargeable Li-PO battery for RC electric. Size: 48mm L x 30mm W x 14.0mm thick (1.89"L x 1.18"W x 0.56" thick). Comes with red JST connector and Balance Charge connector. Fits in UDI U829, V912 ,V262, V353B RC Helicopter. Can also be used as a Receiver Pack with a Voltage Regulator (sold separately). Re-charge with an approved Li-PO charger such as the B3AC, CoolCharger A3.