Most Used EV Batteries Stay Above 95% Capacity, UK Study Finds
A UK Generational study of more than 8,000 EVs tested in 2025 found an average battery health of about 95%, with degradation largely tied to age and usage rather than mileage. Even 8–12-year-old EVs can retain over 85% of their original capacity, though the spread widens with age. Extreme fast charging, deep discharges, and cold climates accelerate degradation. The findings suggest used EVs are generally healthier than feared and underline the need for independent battery-health testing to aid buyers and resale values.