"The predictions were not soothing. In 2010, the New York Times wrote that "estimates of [EV] battery packs' lifespan — no one knows for sure — range upward from seven years." The average car on the road is more than 12 years old. And that discrepancy made some would-be EV buyers nervous.
Batteries come with warranties, but they don't last as long as the car. If a high-voltage battery chokes out midway through a car's life, it needs replacing — at a price tag that can run in the ballpark of $5,000 to $20,000."
This factor has probably been my biggest resistance to getting an EV versus the cost of maintaining a traditiona engine, personally. So the article's results are actually good news.
EV batteries lasting longer than we expected is such a relief. Makes switching from gas cars a lot less scary.