Avloo Report Compares Battery Health Across 20 Popular EV Models
The study analyzes over 500,000 independent tests to reveal significant variance in battery state of health between models and individual vehicles.
EV battery diagnostics specialist AVILOO has released what it describes as the world’s largest independent study of battery health in used electric vehicles, analyzing data from over 500,000 tests conducted between 2022 and 2026.
What Happened
The AVILOO Certified EV Battery Report covers 20 popular EV models, calculating the median State of Health (SoH) at mileage milestones of 50,000 km, 100,000 km, and 150,000 km. The study identifies three consistent patterns: median battery health declines with increased mileage, the variance between individual cars widens as distance increases, and distinct performance differences persist between models at every mileage point. According to AVILOO, the Hyundai IONIQ 5 achieved the highest median SoH, ranging from 97.2% at 50,000 km to 92.8% at 150,000 km. The Volkswagen ID.4 followed with figures between 95.3% and 90.6%, while the Tesla Model Y recorded median SoH levels from 94.5% to 90.3%. The report emphasizes that these figures are derived from AVILOO’s proprietary FLASH Test, a three-minute diagnostic performed via the vehicle’s OBD port, rather than relying on the car’s internal battery management system readings.
Why It Matters
The report highlights significant discrepancies between average performance and individual vehicle condition, noting that SoH can vary by up to 11% across cars of the same model. AVILOO states this variance translates to approximately 46 km of real-world range per charge, a difference that could determine whether a vehicle completes a long trip without an additional charging stop. For buyers, sellers, financiers, and insurers, the data suggests that dashboard readings may not accurately reflect a battery’s true condition. AVILOO CEO Marcus Berger noted that while EV batteries generally age better than public perception suggests, the critical factor is the substantial variation between models and individual units, which directly impacts range and resale value.
The Bottom Line
AVILOO’s independent testing indicates that while median battery health remains high across major EV models, individual vehicle variance is significant enough to affect practical range and value, supporting the company’s recommendation for independent diagnostic testing before purchase or sale.
