Fuel cells can have a large savings for large battery users. Fueling up with hydro in a couple of minutes for the whole day would be a dream come true. Presently the Fuel Cells are too expensive along with the reformers. Fuel Cells can range from $10,000 to $30,000 each and the reformers (hydrogen makers) can cost as much as $15,000 per truck. No company would invest in this cost today or anytime soon. Fuel Cells can be the answer for battery replacement and maybe propane but not at todays cost. The cost will be much lower soon. Only time will tell.