This is a question for those electrical engineering types out there, as for the life of me, I have Never understood electricity. My R-4 will run on 9-12V. Is the current draw different at each voltage, i.e., would a 9V battery with the same amp hours last shorter, longer or the same as a 12V. I am also considering a V3, and if I got a 12V model, would that allow me to run both the R-4 and the V3 from the same battery, assuming sufficent Mah, and amp handling? I have also seen people running 6V V3s with the 9V Wally battery. Will this cause issues in the long run, make it run hotter, fry electronics, etc?