zoomkat:
Hobby type R/C servos don't NEED 6V, their typical operating voltage range is 4.8 to 6vdc.
Well, the lower voltages are ok when only a rudder and other light loads are being moved. If the servo is expected to hold/move any real load, 6v will be much better. Check the torque specs for servos operated at 4.8v and 6v.
Just means one just needs to pick out their servos while keeping in mind the operating voltage they will be using.
Lefty