Interesting. Another tesla related article. 2008 roadsters on original battery packs are apparently still functioning well but those that paid $32k in 2016 or later for an "upgraded" pack are starting to see some failures (bad enough to make the car useless without a new battery pack).
Tesla Roadster Batteries Are Failing, Revealing End Of Life Symptoms
Original battery packs can go 15 years, but younger upgraded packs are failing early.
insideevs.com