You can purchase accessory parts from any authorized Great Planes hobby shop or a mail order company such as Tower Hobbies at 1-800-637-6050.
The part number that you need is:
FUTM1463 NT8JY TX NICD 9.6V 4NBL 3PJ
Sincerely,
Krysta
Product Development & Support Specialist
Futaba Service Center USA
[email protected]