Why Is Tesla Selling 2021 Models With 2017 Battery Packs?

Determining what year a car is can actually prove to be a trickier question than you’d think. The year the car was actually manufactured is a huge part of it, of course, but what about a car made from unused old stock? Or there’s the case of VW’s mascot Beetles, named Max, all of which look like 1963 cars but were actually built in 1964. Currently, this question is on my mind because Tesla seems to be selling a lot of 2021 Model 3s that may come with battery packs built in 2017. What’s going on?
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