I have been following this for some time now. What I do not get is why a voltage regulator is not the answer. Who cares about the batteries if you are limited on the voltage available to your motor. This is very easy to tech, then you don't not have worry about if someone has something special. Turn on the car, take a reading and if to much voltage is coming out of the regulator, then you are DQed. It is elec. most everyone has a meter, so there should be no reason for you to "not know".
I just do not get all this talk and the answer is a simple one.
Or what I'm I missing?