Tesla Motors Inc. said it is offering its electric vehicles with a battery capable of going up to 315 miles on a charge, the first time a major auto maker has provided that much electric range in a vehicle. The company unveiled new versions of its Model S sedan and Model X sport-utility vehicle with 100 kilowatt-hour batteries; previously the largest battery size was 90 kwh. The upgrade will allow the Palo Alto, Calif-based company to sell a P100 version of those two vehicles with Tesla’s well-known “Ludicrous Mode.” In a conference call, Tesla Chief Executive Elon Musk said Tesla will now offer the “fastest car in the world,” and he said the fact the vehicle is an electric one is a milestone that foreshadows the future of the auto industry. Tesla claims the 100 kwh sedan can travel from 0 to 60 miles an hour in 2.5 seconds, while the SUV can achieve it in 2.9 seconds.