Well one could put a few on a battery pack, but I believe the price would be a bit steep. The main reason I posted it was for the technical side of it, this is something if build to a larger scale would be nice for EV's. The idea of charging at high amperage from a LA battery pack will be a neccessity, considering the high amp battery pack which will be the norm.
When you start talking about using 200AH or higher battery pack, the question becomes, how and from where are you going to get the power to charge such pack at a reasonable time span. Using mains power has its limitations, so using a LA battery station seems the only answer at this time.
Roy