The new 4 and 6 channel FASST receivers are 8.4v
This is a quote from Bill Baxter on another forum:
http://rc.runryder.com/helicopter/t613644p1/
"Receivers have no problems with 8 Volts. The servos are what have limits."
Bill Baxter, Manager
Futaba Service Center North America
3002 N. Apollo Dr. Suite 1
Champaign IL 61822
USA
Phone: (217) 398-0007
Fax: (217) 398-7721
Email:
[email protected]
Web:
http://www.futaba-rc.com/index.html