Duralite Receiver 2300mAh 2S 6.6V Lithium Phosphate (A123) Battery Pack with built-in Balancing Safety Circuitry, Rx Lead with Universal Connector and 16 gauge High Power Lead with Spectrum EC3 Connector. Specifications: Dimensions: 3" x 1 1/4" x 2" (76mm x 32mm x 50mm) Weight: 6.4 oz. (180g) Voltage/Capacity: 6.6V/2300mAh Configuration: 2 cells in Series Charge only with Li-Phosphate Charger!!!! No Voltage Regulator necessary, plug directly to Rx!!!!