Battery-car start-up Tesla Motors hopes to put a quick-charging “supercharger” within the reach of all U.S. motorists – and most of those in Canada – over the next several years, something that could eliminate the so-called “range anxiety” that has so far been a factor in the limited sales of plug-based” vehicles like Tesla’s Model S. The roll-out of the Tesla Supercharger network will now come twice as fast as originally planned, with about twice as many of them being put in place, according to the maker’s founder and CEO Elon Musk.