Woa!!!! Bl Servos!!!!

[BrianG]

I don't think it much matters to the servo. There is nothing voltage-limited in a servo really - they just design them for 4.8-6v because that is what everything runs. With higher voltage, the circuits would have to be designed to take it, and the motor would have a lower kv. And you gotta think about the receiver as well - most can't take much more than 6.5-7v.