The ranking forms part of Carla’s Electric Vehicle Battery Study 2026. It compares average battery health across individual electric car models after more than 10,000 kilometres of driving. A total of 9,954 battery tests were carried out for the analysis in Sweden between 2022 and 2026 using diagnostics from Austrian battery specialist AVILOO. Carla says the dataset is one of the largest collections of battery health data from the Swedish used EV market.
Only models with a ‘sufficiently large number of battery tests’ were included to ensure meaningful comparisons, the EV retailer states.
The Kia e-Niro with the 64 kWh battery achieved the highest average battery health at 97.25%, followed by the Hyundai Kona Electric (64 kWh) at 97.18% and the Kia EV6 (77.4 kWh) at 95.95%.
Other leading models include the Volvo XC40 Recharge with the 69 kWh CATL battery at 94.70%, the Polestar 2 with the 78 kWh CATL battery at 94.35% and the BMW i3 with the 120 Ah battery at 93.77%. Tesla’s highest-ranked model was the Model 3 with the 60.5 kWh CATL LFP battery, recording 93.34%. The top 20 also includes the Audi e-tron 50 and 55, Skoda Enyaq iV, Volkswagen ID.3 and ID.4, Tesla Model S, Model X and Model Y, and the Audi Q4 e-tron.
