Tesla has a new $29,000 battery upgrade for its old Roadsters
 

In August 2014, Tesla CEO Elon Musk talked about "a fairly exciting upgrade" (i.e., an improved battery pack) to the company's first car, the Lotus-based Roadster. Today, we can finally put a price tag on what it'll cost you to give your aging all-...

http://www.engadget.com/2015/09/01/t...&ncid=rss_semi