Power advice with only AA batteries

zoomkat:

Or are you saying servos should always be powered by 6vdc because that way they deliver their highest speed and torque?

I said "If the servo is expected to hold/move any real load, 6v will be much better.(...)

What about the way to plug it? Directly into the motor shield (or via a breadboard...)

And same question for the power to my Arduino... Do I plug directly the 6 volt into the shield and let the shield power everything so far ? Or there's a circuit that would optimized my ernegical demand?
Thaanx again guys