![Tesla Model S lithium-ion battery pack in rolling chassis [photo: Martin Gillet via Flickr]](http://images.hgmsites.net/tmb/tesla-model-s-lithium-ion-battery-pack-in-rolling-chassis-photo-martin-gillet-via-flickr_100481091_t.gif)
Perhaps the biggest question in buyers' minds over electric cars is how long the batteries will last. Most new-car buyers have mobile phones whose batteries have only lasted a couple of years, perhaps less. Even as electric-car battery packs are warranted against outright failure for eight or 10 years, how much degradation should owners... Tesla Model S battery life: what the data show so far
Perhaps the biggest question in buyers' minds over electric cars is how long the batteries will last. Most new-car buyers have mobile phones whose batteries have only lasted a couple of years, perhaps less. Even as electric-car battery packs are warranted against outright failure for eight or 10 years, how much degradation should owners... ![Tesla Model S at Supercharger site in Ventura, CA, with just one slot open [photo: David Noland]](http://images.hgmsites.net/tmb/tesla-model-s-electric-car-road-trip-upstate-new-york-to-southern-california-photo-david-noland_100500011_t.gif)
Tesla continues to make sweeping changes as it prepares for the launch of the Model 3, its first mass-market electric car. The company has announced a significant expansion of its global network of Supercharger DC fast-charging stations. Executives believe, it said, that charging should be “convenient, abundant, and reliable” for all... 
Back in 2014, Tesla had a spate of problems with the drive units in early-production versions of its Model S electric sedan. (The drive unit is essentially the car’s power train: electric motor, inverter, and gear box.) High-profile multiple failures occurred in long-term test cars driven by Motor Trend magazine and the automotive website... 
Tesla has issued a voluntarily recall for roughly 53,000 of its Model S and Model X electric cars to address an issue in which the parking brake might stick in the engaged position. The recall was first reported yesterday by CNBC. The vehicles affected were built between February and October of 2016, and 31,000 of them were sold in the U.S. It is... 
Tesla has released updated pricing and features for its 2017 Tesla Model X all-electric crossover utility vehicle, including lower prices for both the 75D and 90D models. Like the changes released at the same time to the Model S sedan, the new lineup increases the distance between the two lower-end models and the top-of-the-range 100D and P100D... 
As its owners know, although much of the car-buying world doesn't, Tesla doesn't believe in the idea of model years. Rather than updating its electric cars each autumn, to correspond to a new model year, it simply changes them when it feels the updates are ready. This can lead to some confusion over the features and capabilities of a give car... 
Relative few companies regularly make major announcements via their CEO's Twitter account, but electric-car maker Tesla is different. From software updates to dates for new product lines, tweets from Tesla's CEO Elon Musk routinely make news. And so it was this week, when Musk announced the months in which the company plans to reveal designs for... 
It remains unclear whether Tesla will survive as an independent company, given that it's had exactly two profitable quarters in its 12-plus years of existence. And yet, last week, Tesla briefly passed General Motors to become the most valuable U.S. automaker by market capitalization. It had passed Ford last week, and long ago surpassed the value... 
The numbers are in, and Tesla says it delivered 25,000 electric cars globally in the first quarter of this year, from January through March. That's a new quarterly record for the Silicon Valley company, which delivered 76,230 cars last year. Analysts and Tesla fans had eagerly watched for this number, as they do all Tesla financial information...