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Battery degradation is one of the biggest concerns for electric car owners and potential buyers, but data from Tesla battery packs have been very reassuring so far.

Now the latest data shows less than 10% degradation of the energy capacity after over 160,000 miles on Tesla’s battery packs.

The Tesla pack on my Rav4 EV has degraded about 7% in 3.5 years and 54,000 miles. The difference is that the BMS and the thermal management system in the Tesla Model S and X is always running. In the Rav4 EV they are only running when the car is in "Ready" or when it is charging.

Sure you lose range if it is always on. You're going to have that vampire load that drains it down over time. But Id rather have it than not.
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