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-electric sports car around 35-percent more energy capacity and around 40-percent more range. In short, getting the new, roughly 70-kWh pack will set you back $29,000. Be warned: The new pack is heavier than the older one.