Come to think about it--the easiest hack-- is just a piggback battery. Lets say the Tesla power-source is 500 pounds. 1/10th would be 50 pounds. Assuming replac

Come to think about it--the easiest hack-- is just a piggback battery. Lets say the Tesla power-source is 500 pounds. 1/10th would be 50 pounds. Assuming replacement of the battery is $15K at cost, that would be a $1500 asset. 4x of them would add ~$6K per charging depot (<~5% of planned capital outlay). Transport to site by 3rd pary service using a pickup truck (ie, no fancy gear needed). Volumne would be the size of a a carry-on wheelie bag. The engineering solution would be to have a second charging point internal to the passenger/trunk--perhaps in the 2.0 version of the Tesla models currently on the board. The only engineering consideration would be that the li-ion powertrain would need to operate during charge (like a laptop or cell phone) but would presumably overcome.