The study analyzed 20 popular EV models, including the Tesla Model Y and Volkswagen ID.4, based on more than 500,000 tests conducted globally between 2022 and 2026. The results showed that the median state of health (SoH) for these models remained between 87% and 94% after 150,000 km of driving.
Median SoH levels were recorded at 91-97% after 50,000 km and 88-95% after 100,000 km. However, degradation speed varied significantly based on climate conditions, battery size, and driver habits, such as parking practices.
For the Nissan Leaf ZE1, the median SoH at 150,000 km varied by 13.5 percentage points, which is equivalent to about 29 km of real-world range per charge. This was the largest spread among the 20 models studied. Other variations were up to 11 percentage points for the Tesla Model Y, 11-12 points for the VW ID.4, and over 12 points for the Hyundai Ioniq 5.
Climate and charging habits are key factors in battery longevity. Marcus Berger, CEO of Aviloo, noted that batteries in hotter climates degrade faster. He also advised against parking cars with a charge level of 80%, 90%, or 100%, stating the ideal level is between 30% and 70%.
In the UK, three of the largest EV organizations have called for the government to introduce mandatory battery health certifications. James Strong, a manager at Tesla UK, supports this move, stating that nationally recognized standards would increase transparency and confidence in the used EV market.
