Research conducted by Arval found that electric vehicle (EV) battery health decreases by 1% every 25,000km (15,534 miles), after a larger initial decrease.
EVs tested with 160,000km (99,419 miles) or six years of use had a battery health figure of above 90%.
Arval said that newer generation EV models typically showed battery health figures two or three percentage points higher than older models, due to improvements in design, cooling and energy management systems.
The research was based on 24,000 battery health certificates from across 11 European countries.
66% of the vehicles analysed were EVs and 33% were plug-in hybrids (PHEVs).
Gary Burns, director of procurement and remarketing, Arval UK, said: “As EVs move into the used market in greater volumes, transparency around battery condition is increasingly important.
“We want our customers to be able to purchase our vehicles with confidence, which is why battery health testing has become a significant part of our remarketing process.
“Encouragingly, the results we’re seeing show that batteries in used EVs stand up well in real-world use, helping to reassure buyers considering this fuel type.”
The upcoming Euro 7 regulations will require all EVs and PHEVs to retain at least 72% of their original capacity at eight years old or 100,000 miles.
Pascal Seeger, global remarketing director at Arval, said: “This update fully confirms the insights shared last year: batteries maintain a high level of performance over time, beyond market perceptions.
“This is very good news for used car buyers, who can be confident in the durability and reliability of electric vehicle batteries over the long run.
“By providing consolidated and comparable data, we help remove barriers to buying used EVs and accelerate the development of a more transparent and reliable market.”
