Includes: (1) Flight Pack, (850mAh, 25C). Requires: Charging and installation in your R/C helicopter or plane. Specifications: 3S 11.1V 20awg JST (BEC). Voltage: 11.1 Capacity: 850mAh. Charge rate: 25. IR Milliohm: 34-68. Discharge Wire Connector: 20awg, JST. Weight: 2.29oz, or 65 grams. Height: 0.93", or 23.5mm. Lenght: 1.26", or 32mm. Width: 2.25", or 57mm.