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Pricing used EVs is still one of the harder parts of the used car business. Data from more than 500,000 independent tests points to one reason. Cars that look identical on paper can differ by up to 13.5% in battery health, and across a whole used EV stock, that difference adds up in the margin.
When a used EV comes in for part exchange, many appraisals still rely on the same information as for a petrol car: age, mileage, condition and the book price. The battery accounts for a large part of an EV’s value, yet its condition is often judged from what the vehicle itself displays.
The AVILOO Certified EV Battery Report shows what that can cost. AVILOO analysed more than 500,000 independent tests on 20 popular models, carried out between 2022 and 2026, which makes it the largest independent study of battery health in used EVs. Most batteries in the study are in strong health. Even so, the state of health (SoH) of the best and the worst examples differs by up to 13.5%, and these differences do not follow age or mileage in any neat way. The values shown in the dashboard cannot close this gap on their own, because they differ from manufacturer to manufacturer and do not always reflect the battery’s real condition.
For a dealer, this means that two cars which would get the same price at appraisal may not be worth the same. If the weaker one is bought at full price, part of the margin is lost before the car has even been prepared for sale. A cautious offer on a car with a healthy battery, on the other hand, can send the customer to a competitor. For a dealer group with a growing share of EVs in its used stock, these differences come up with every car it takes in, which makes battery health a factor in the used car margin of the whole business.
The AVILOO FLASH Test was developed for exactly this moment. It calculates the battery’s SoH within minutes, independently of the vehicle manufacturer, and records the result in the AVILOO Battery Certificate. The appraiser can then base the offer on the actual condition of the battery instead of an estimate.
The certificate stays with the car when it moves into retail stock, and that is where it pays off a second time. In the AVILOO Remarketing Study 2024, carried out in Europe, certified used EVs sold up to 36% faster, and 81% of buyers said they trust a dealer more when it provides an independent certificate.
In the UK, the certificate has offered even more since 1 July 2026. For qualifying vehicles, it now includes the AVILOO Battery Warranty at no extra cost. The warranty runs for 12 months or 20,000 km. If a second FLASH Test within that period shows that the SoH has fallen below the vehicle-specific threshold, the customer receives £2,700 and a refund for the second test. The warranty is insurance-backed.
Buyers who are still unsure about a used EV therefore get a documented battery result and protection for their first year of ownership. For many of them, that is a concrete reason to buy from the dealer who offers it.
The AVILOO Battery Warranty is available in 26 European markets, and AVILOO will publish the Certified EV Battery Report twice a year. Dealers who want to know how healthy the batteries in their used EV stock really are can contact the AVILOO UK team.
Company contact details
Stefan Holzschuh, Teamlead Global Reseller Sales
AVILOO Battery Diagnostics
[email protected]| +43 676 448 86 65