HiTEC 54124: 7.2 volt rechargeable NiCad 1100mAHr battery pack, with HiTEC white (ELCO) connector. Fits Optic Sport 6, Optic Sport 3, Replaces original part # 54124. This is a triangular-shaped battery pack, about 4" long. Includes connector, so it can plug right into your HiTEC transmitter. These battery packs are made in the USA.