This is the 6.0V 1700mAh NiMH Battery for the Futaba 4PK 4-Channel 2.4GHz Transmitter * This also fits the 6J transmitter FUTK6000 * FEATURES: Pre-installed Futaba J connector INCLUDES: One 6.0V 1700mAh Transmitter Battery REQUIRES: HBC-3B(4) 120V AC Battery Charger (FUTM1832) SPECS: Length: 85mm (3.3") Width: 18mm (0.71") Height: 44mm (1.7") Capacity: 1700mAh Charge Rate: 170mA cnh 5/12/09 ir/jxs