EV battery diagnostics specialist AVILOO has released what it calls “the world’s largest independent study of battery health in used electric vehicles.”
The latest edition of the AVILOO Certified EV Battery Report analyses over 500,000 individual, independent tests carried out on used EVs between 2022 and 2026, covering 20 popular EV models.
“The findings carry a clear message for anyone buying, selling, financing or insuring a used EV,” says AVILOO. “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.”
AVILOO tests EV batteries using its proprietary FLASH Test. For each model, AVILOO calculates the median State of Health (SoH) at three mileage milestones—50,000 km, 100,000 km and 150,000 km. Comparing the three mileage snapshots side by side reveals three consistent patterns, AVILOO tells us. First, median battery health drops as mileage increases. Second, the spread between individual cars widens with distance. Third, there are consistent differences between models at every mileage point.
AVILOO’s FLASH Test includes a three-minute diagnostic performed via the vehicle’s OBD port, and it generates a battery health certificate for each individual used vehicle. Rather than reading a figure generated internally by the car’s battery management system, AVILOO says it calculates SoH using a statistical model trained on hundreds of thousands of real used vehicles. In addition to the car’s internal health assessment, AVILOO also takes into account mileage, age, cycles, cell voltage spread, energy counts and multiple other diagnostic signals.
The Hyundai IONIQ 5 appears to have scored the best in AVILOO’s testing—median State of Health ranged from 97.2% at 50,000 km to 92.8% at 150,000 km. The Volkswagen ID.4 scored slightly lower (95.3% at 50,000 km to 90.6% at 150,000 km), followed by the Tesla Model Y (94.5% at 50,000 km to 90.3% at 150,000 km).
It’s important to note that these are median figures for all the cars tested. The SoH of individual cars can vary by up to 11% across the mileage range. This translates to around 46 km of real-world range per charge—an amount that can make the difference between “a car that comfortably completes a long day trip and one that needs an extra charging stop.”
“The truth in this data is that averages hide a lot,” said AVILOO CEO Marcus Berger. “Yes, EV batteries are ageing better than the ‘they wear out fast’ myth suggests—but that’s not the most useful thing this report tells you. What matters is that battery health varies significantly between models, and even more between individual cars of the same model. A gap of ten or fifteen percent in state of health is a real difference in range [and] in what a car is worth. You simply can’t know where your car sits in that range without testing it independently.”
Source: AVILOO
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