Nearly 10,000 battery tests found that two EVs retained more than 97% of their capacity after 62,000 miles.
The top three performers were all Korean EVs, led by the Kia e-Niro.
Even the lowest-ranked model in the top 20 still retained more than 91% battery health.
Battery degradation is one of the big unknowns when buying an electric car, and it’s especially important if you’re looking to buy used. Mileage tells you something, and it correlates with capacity loss. But the odometer alone can't tell you how well—or poorly—an EV has aged.
Two seemingly identical EV batteries with similar mileage can age very differently depending on how and where they are used, charging habits, and what car they're installed in. That is what makes studies like this one from Sweden’s Carla, a used car marketplace, particularly useful. It compiled 9,954 EV battery health tests it conducted between 2022 and 2026 to see which models retain the most capacity after years of use and 100,000 kilometers, or around 62,000 miles, on the odometer.
