How long an EV battery will last revealed
By James Cleary · 10 Sep 2026
We now know the truth about how long a car battery will last.Austrian battery diagnostics specialist Aviloo has worked out which vehicles perform best when it comes to an EV battery’s state of health (SoH) over time and distance.In its 2026 Certified EV Battery Report the company has analysed more than 500,000 Aviloo ‘Flash Test’ results from 2022 to 2026 across 20 high-volume electric car models in North and South America, Europe, Australia and Asia to determine the best performers.The flash test is a three-minute diagnostic check that assesses the health and performance of an electric vehicle's high-voltage traction battery.Rather than registering a value reported by the car's on-board battery management system, the flash test “independently calculates SoH using a statistical model trained on hundreds of thousands of comparable used vehicles, factoring in mileage, age, (charge) cycle count, cell voltage spread, energy counters and other diagnostic signals.”In releasing its results Aviloo made the point that, buyers of used internal-combustion cars rely on odometer readings and service records, but was not the most accurate way to tell an EV battery's state. “The battery is the single most expensive component of an electric car, and the one with the widest variation from vehicle to vehicle.“Two used electric cars with 50,000 kilometres on the odometer might present in what appears to be identical condition but can differ by up to 10 percentage points in battery SoH,” it said.The data reflects three mileage milestones (50,000, 100,000 and 150,000 kilometres), identifying the SoH range covering 99 percent of all independently tested vehicles of that model. The company made the point, “Battery health varied within each of the 20 models tested, between models and, above all, between individual vehicles of the same model. An average per model therefore says little about a specific car."SoH can vary by up to 13.5 percentage points between the best and weakest examples of the same model,” it said.As a result the median serves as the reference point in each case.The spread across the 20 models tested was already clear at the 50,000km mark with four examples highlighted for more detailed analysis in line with their different sizes, typical use and battery types.Hyundai’s Ioniq 5 had the best SoH of the four models, with range barely falling from 335 to 321km and a spread of 37 kilometres between the extremes recorded.As one of Europe’s best-selling EVs, the VW ID.4’s potential range fell from 373 to 355km, with up to 44km between the best and the weakest vehicle at 150,000km.The Tesla Model Y, the world's best-selling car for the last three years, saw its real-world range fall from 379 to 361km at 150,000km, with a 46-kilometre difference between the best and the weakest example tested.The Nissan Nissan Leaf ZE1, with the smallest (40kWh) battery of the four models highlighted the finding that smaller batteries with more frequent charging cycles age faster on average. Across all three mileage levels analysed, the Nissan had the lowest SoH of the four models examined in detail, with its real-world range dropping from 195 to 185km.Other models that performed well after 150,000km travelled were the Mercedes-Benz EQA (93.97 SoH), BMW i4 (93.62), Hyundai Kona EV (92.95), Volvo XC40 Recharge (92.79), Ford Mustang Mach-E (92.53) and Polestar 2 (92.46).Some that didn't fare as well were the Renault Zoe (87.33) and Tesla Model 3 (88.94).Commenting on the report Aviloo CEO Dr. Marcus Berger said, “The truth in this data is that averages hide a lot. “Yes, electric car batteries age better than the myth of rapid wear suggests, but that is not the most important finding. “What matters is that battery health varies widely between models, and even more widely between individual vehicles of the same model,” he said.The Aviloo Certified EV Battery Report will now be published twice a year, drawing on the company’s global diagnostics database, which holds more than one million independent tests.