Thierry,
The S9451 can be used with either 4.8 or 6 Volts, the information given on our website as per the torque rating though is listed at 6 Volts as this is what it was intended to be used with.
I hope you find this information helpful. Should you have any further questions or concerns, please do not hesitate to contact us at 217-398-8970 for Support, 217-398-0007 for Service or via fax at 217-398-7721 or by email at
[email protected].
Sincerely,
Krysta
Lead Futaba Customer Service and Programming Technician
Also you may want to check our Website at (
http://www.futaba-rc.com)