This is the LT2F3500XH LiPo Transmitter Battery for the Futaba 18MZ. FEATURES: 7.4V 3500mAH Rigid plastic case Charges through charging port in transmitter INCLUDES: LT2F3500XH LiPo Transmitter Battery REQUIRES: Charging through transmitter with the 18MZ AC Wall Charger, FUTM1718 jxs 07/05/12 ir/jxs