A Tesla Model S electric car is shown for sale at a Tesla store in a shopping mall in La Jolla, California in this September 6, 2013 file photo. Popular electric carmaker Tesla Motors Inc may name ... more 
A Tesla Model S electric car is shown for sale at a Tesla store in a shopping mall in La Jolla, California in this September 6, 2013 file photo. Popular electric carmaker Tesla Motors Inc may name South Korean battery producer Samsung SDI Co Ltd as an additional supplier as the California auto upstart tries to add more models and expand, although at least one source familiar with the discussions described the deal as being far from done. REUTERS/Mike Blake (UNITED STATES - Tags: TRANSPORT ENERGY) less 
1 / 23
Reuters | Photo By MIKE BLAKE / REUTERS
Fri, Oct 4, 2013 3:23 AM EDT