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A recent study by Which? shows that EV battery degradation is less severe than buyers fear, with only a 7% loss over seven years for models from 2017-2018.

As more drivers shift to electric vehicles (EVs), one of the most pressing questions remains: how quickly do EV batteries lose their range over time? A new study by Which? reveals what first-time buyers can expect, shedding light on the actual lifespan of EV batteries. With Elon Musk’s Tesla facing its first sales decline in over a decade—partly due to controversies surrounding Musk’s politics—attention has turned to battery performance across the EV industry.

The Study That Answers EV Buyers’ Worries
Which? surveyed 3,595 EV owners to determine how much battery life degraded over seven years of ownership. Owners of EVs bought around 2017-2018 reported a 7% decline in battery capacity, leaving them with 93% of their original range. For an EV with a new range of 180 miles, that would drop to 167 miles after seven years—a relatively minor loss considering the age of the car.

Those who bought their vehicles in 2019-2020 saw a 4% decline, while EVs purchased in 2021 or later experienced only a 3% drop. The study also found that the average annual mileage among respondents was 6,001 miles, meaning drivers with lower mileage may see even better battery performance.

Owners of EVs bought around 2017-2018 reported a 7% decline in battery capacity, leaving them with 93% of their original range.

Cold Weather and Charging Habits: What Affects EV Battery Health?
Battery degradation isn’t random—it’s influenced by several key factors. According to Which?, frequent charging, weather conditions, and charger strength all play roles. Cold weather, in particular, can reduce a car’s range by up to 40% and slow charging speeds significantly.

The company also highlighted the impact of a significant 30% drop in battery life, noting that it could make uninterrupted journeys difficult without extra charging stops.

Is Battery Degradation Really a Dealbreaker?
While all batteries degrade over time, Which? concluded that the decline in EV battery life isn’t as bad as many buyers fear—especially in the early years of ownership. The study reassures buyers that even after several years, most EV batteries will maintain the majority of their original range, making the switch to electric a more sustainable choice than many might assume.

Whether you’re buying your first EV or upgrading from an older model, this data should offer some peace of mind about how long you can rely on your vehicle’s battery.