This is the Great Planes ElectriFly 8-cell 650mAh NiMH Battery.FEATURES: Rectangular shaped shrink-wrapped and pre-assembled with red 2-pinconnector (GPMM3106)Used in ElectriFly Park Flyer model airplanesINCLUDES: One Great Planes ElectriFly 8-cell 650mAh NiMH BatteryREQUIRES: Charger capable of charging Nickel Metal Hydride batteries.Suitable chargers: ElectriFly DC Peak (GPMM3000), Triton (GPMM3150)SPECS: Cell Size: 2/3 AALength: 2-3/8" (61mm) Length of lead: 4" (101mm)Width: 1" (25mm)Height: 1" (25mm)Weight: 4.40oz (125g)