How many Tesla cars already needed battery replacement?

The current battery in a Tesla is built to last at least 500,000 miles (800,000km) before it needs to be replaced, currently most batteries look like they will last a lot longer than this. Tesla battery data shows path to over 500,000 miles on a single pack. read more

The battery in Tesla cars will last a very long time before you need to replace it, if you drive over 800,000 km you might notice significant loss of up to 20% but even then you can just get a new one installed for around $10,000 US dollars, and then you’re good for another 40 years of driving. read more

The warranty on a Tesla battery is 8 years (unlimited miles), so I would assume that, barring a manufacturing defect, the replacement time would be something beyond 8 years. Teslas haven’t been around for 8 years, so there is no empirical data. read more

Tesla's already using refurbished battery packs in their Service Centers - so the cost of replacing a battery pack for a car being serviced is much less than the cost of a brand new battery pack. A similar strategy might be used if/when Model S battery packs start showing significant range loss. read more

Recent research in Tesla battery degradation has finally come out after data from Teslas many many years old have been compiled. The data show that Tesla has correctly combined Battery Temperature Control, Quick Charging, with real world charging behaviour. Old Battery packs have degraded by super small increments. read more