If you buy a Tesla today, they say that you should expect to swap it out after 8 years. That is when the batteries have lost 20% of their range.
Seeing how Teslas are mainly commuter cars, if you use it for anything other than short hops to work and home, never allowing the battery to discharge less than 50% Then you'll get the 8 years.
But if you drive it until the charge drop below 50%, or use it for more than just daily commuting, or (and this is the big one) if your car is routinely exposed to freezing temps, it'll be far less than 8 years. And battery tech has improved over the years. Get a Tesla that's a few years old and it'll be far less.
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