Rdjetflyr, I have an Electrodynamics Pow'rBack'r too and, I am not certain of this, but I do not believe that it has a regulator built in. Of course Andy can tell us for sure. I know there is a voltage drop associated with the unit (that's why if ya wanna use his little voltage checker thingy, you gotta get the one calibrated for use with the Back'r), but I thought that was due to internal circuit resistance, not an integral voltage regulating circuit.