The Li-Po batteries of Fullymax -Transmitter packs series, which are specially designed for Futaba & JR 9X series Transmitters, can be installed in both Futaba and JR 9X series Transmitters and supply stable continuous power for a long time. With the capacity of 3000mAh, they assure more than 6 hours’ continuous working time and steadily discharge for JR FF9 & 9X series, which makes the transmitters work smoothly and dependably. Furthermore, there are PCM in every pack which could protect the pack from over charge and over discharge.