The message is clear: test your car independently, don’t guess its health
- AVILOO has launched the AVILOO Certified EV Battery Report, the world’s largest independent study of used EV battery health, published twice a year. It is built entirely on AVILOO Certified EVs – used cars whose real battery condition is a documented fact rather than a guess
- The current edition covers more than 500,000 independent tests on AVILOO Certified vehicles from 2022 to 2026 across 20 popular EV models, part of AVILOO’s global database of over 1 million tests
- The data spans North and South America, Europe, Australia and Asia, capturing how different climates affect battery health and charging performance
- Battery health varies significantly between models, and even more between individual cars of the same model – independently testing your own EV, rather than relying on its dashboard reading, is the only way to really know its condition
- State of Health (SoH), the percentage of a battery’s original capacity that remains, can vary by up to 13.5% between the best and worst-performing examples of the same model.
- The battery tests underpinning the report are AVILOO’s independent FLASH Tests which calculates battery health using trained models rather than relying on a vehicle’s own dashboard reports
- Smaller-battery EVs, which need more frequent charging cycles to cover the same distance, tend to show faster degradation than larger-battery models
- This summer, AVILOO also launched its Battery Warranty across Europe, giving buyers of used EVs a financially backed guarantee on battery health
- Images and charts from this report are available to download here
Wiener Neudorf, September 2nd 2026: AVILOO, the global leader in EV battery diagnostics, has today launched its AVILOO Certified EV Battery Report– the world’s largest independent study of battery health in used electric vehicles.
This edition analyses over 500,000 individual, independent tests carried out on used EVs between 2022 and 2026, covering 20 popular EV models. It draws on a subset of AVILOO’s broader diagnostic database, which now spans more than 1 million independent tests worldwide across North and South America, Europe, Australia and Asia. AVILOO will publish the AVILOO Certified EV Battery Report twice a year.
The findings carry a clear message for anyone buying, selling, financing or insuring a used EV; don’t assume your battery’s health – test it independently. Every figure in this report comes from AVILOO’s own physical measurement of the battery, not a reading taken from the vehicle’s dashboard, which can vary from manufacturer to manufacturer and doesn’t always reflect the battery’s true condition. Overall battery health across the market remains strong, but AVILOO’s data shows meaningful differences both between models and between individual examples of the same model – differences significant enough to change what a car is really worth.
How the report works
The AVILOO Certified EV Battery Report is built on data from used electric vehicles tested via its independent AVILOO FLASH Test. For each model, AVILOO calculates the median State of Health at three mileage milestones – 50,000 km, 100,000 km and 150,000 km – along with the range expected to cover 99% of vehicles at each point†.
State of Health (SoH) – the percentage of a battery’s original usable capacity that remains – is the clearest single measure of how a used EV’s battery has aged; a battery at 95% SoH still delivers roughly 95% of its original range per charge.
Reading the data
The charts below show real AVILOO FLASH Test results from used EVs, presented in alphabetical order, at each of the three mileage milestones. Each bar shows the expected range of battery health for that model at that mileage – the lower and upper numbers mark a 99% prediction intervals band and the black line marks the median result. The data also aggregates multiple battery sizes behind each vehicle model.