Austrian diagnostics firm AVILOO published a study analyzing battery health in 20 popular electric vehicle models. The research relies on over 500,000 battery tests conducted on vehicles with up to 150,000 km of usage. The company uses its proprietary FLASH Test, which connects to the OBD port to calculate the state of health (SoH) independently of the car's own management system.
At 150,000 km, the Mercedes EQA leads the ranking with a median SoH of 94%, followed by the Hyundai IONIQ 5 at 93.8% and the BMW i4 at 93.6%. The Hyundai Kona EV and Volvo XC40 Recharge also remained above 92.7%. Conversely, the Nissan Leaf, MINI Cooper SE, and Renault Zoe showed lower results, which the study attributes to smaller battery packs requiring more frequent charging cycles.
Tesla models ranked in the bottom third of the study, with the Model Y at 90.3% and the Model 3 at 88.9% SoH at 150,000 km. However, the report notes that newer data on Tesla's LFP packs shows better performance. AVILOO highlights that individual battery health within a single model can vary by as much as 13.5%, making standardized diagnostic testing crucial for used car buyers.
AVILOO has performed over 1 million tests globally across North and South America, Europe, Australia, and Asia. The company is a preferred battery-testing provider for Mercedes-Benz, Volvo, and Porsche Holding. Additionally, it launched a battery warranty program in 12 European countries, offering payouts of €3,000 or £2,700 if a battery's capacity falls below a specific threshold within a year.