In theory, this sounds great. However, in practice... its a bit harder. The dial on the PA is not linear. The voltage range of the PA is about 1.2v - 2.0 volts (on mine). At a 40% visual indication on the dial... I'm actually at about 1.46 volts (on my unit and I'm sure there's variance between units). 40%, according to my math and a .8 voltage range of the PA (1.2 - 2.0v)... would actually be around 1.52v. At a 60% visual indication, is when I'm over 1.5v (the math, says 1.68v). A voltage the batteries, won't ever see and meaning, battery users aren't ever getting the cannabinoids.
Fresh charged batteries are at about 1.45v. A day later, without any use... they're at about 1.38 (these are brand new Imedion 2400s). You can get useful vapor/charge out of them, until around 1.1 to 1.2. Then a rapid discharge and they're drained.
I get what you're saying and will definitely give this a try. I just think its going to be a little harder, for others to recreate the same thing, taking actual voltages and the visual indicators of the dial, into account (in my case... which I'm sure is true for others, also). Thanks for another method for our MFLB madness.
EDIT: I think I made sense.