The largest concern with used electric vehicles has been the battery over the years. Fear of failure and replacement bills with five figures have become the defining themes of horror stories, and many buyers are cautious about anything that is not a brand-new EV. However, real-world statistics are now narrating a much different and much more encouraging story.
In a study conducted by Generational, a UK-based EV battery health assessment company, the data of over 8,000 electric vehicles in 36 brands were studied in a large study that was conducted in 2025.
The findings disagree with the fact that EV batteries have a short lifetime or mileage. The cars that were tested had, on average, 95.15% of their original battery capacity, which is much higher than expectations when it comes to long-term battery life.
Age Does Matter, but Not as Much as You Think
The deterioration of batteries exists, and the capacity is decreasing with time. Nevertheless, the paper indicates that this deterioration is normally slow and far below reasonable thresholds. The battery health of EVs between two and three years of age was 96.94%, with a minor decline to 95.17% in the three-to-four-year group. Even the eight to twelve-year-olds had an average of 85.04%, which is still higher than the standard warranty threshold of about 70%.
More importantly, this fact implies that numerous EV batteries will outlive the rest of the car. According to Generational, in its report, battery degradation is not the systemic risk it used to be thought to be. The battery in the majority of circumstances will be comfortable to pass warranty even in advanced ages and mileage.
That said, averages do not tell the whole story. As EVs age, outcomes diverge. This research observed that the 1% of vehicle lowest performance in the four-to-five-year segment still had well more than 80% of capacity left. These exceptions are the reason why the horror stories exist, but it is the exception rather than the rule.
Mileage Is Not the Villain Either
The other presumption that many assume is that when the mileage is high, the battery is worn out. The data doesn’t support this. Most EVs that traveled more than 100,000 miles reported having 88% to 95% of their original capacity, even when old. This supports one of the main arguments: the manner in which the battery is utilized is more important than the distance covered by the vehicle.
The main causes of accelerated degradation include fast charging patterns, deep discharges, and exposure to extreme climatic patterns. These factors are more sensitive in older EVs and more so in the battery chemistry of early-generation batteries.
As an illustration, a Tesla Model 3 with high mileage, allowing heavy use of fast-charging infrastructure and residing in a cold area, exhibited above-average degradation – still, even there, that is just one usage pattern, not an empirical generalization.
The Importance of Battery Health Testing
Among the main findings of Generational is the idea that battery health tests are to be made typical of the used EV market. The same car model, year, and mileage might have vastly different battery health after they were treated differently. Lack of clear data will make buyers take the worst position, and this will reduce resale values and delay adoption.
Expansive testing would minimise uncertainty levels, increase confidence, and fairly value used EVs. It would also isolate bad apples that are few in number, and the rest of the vehicles that still have years of dependable service remaining.
