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Largest Independent Study Finds Most EVs Retain About 90% Battery Capacity After High Mileage

AVILOO’s half‑million test report pushes used‑EV buyers, fleets and insurers to rely on quick OBD diagnostics to judge individual car battery health.

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World's largest independent EV battery study launched, smaller vehicles show faster degradation.
This Study Covered 500,000 EV Batteries. Some Models Aged Much Better Than Others: Buying Tips

Overview

  • AVILOO published a global analysis of more than 500,000 independent FLASH Tests showing median state of health (SoH) for 20 popular models clustered around 90% or higher through roughly 150,000 km.
  • The top median performers at 150,000 km include the Mercedes‑Benz EQA (about 94%), Hyundai IONIQ 5 (about 93.8%), and BMW i4 (about 93.6%), while small‑battery cars such as the Nissan Leaf, Renault Zoe, and MINI Cooper SE score in the mid‑80s percent.
  • AVILOO found large variation between individual cars of the same model, with SoH spreads up to roughly 13.5 percentage points, meaning two identical used EVs can offer materially different real‑world range and value.
  • The company attributes differences to battery chemistry, pack size, climate exposure, frequent fast charging and long periods at 100% charge, and it promotes its three‑minute OBD‑based FLASH Test as a standardized measure rather than dashboard figures.
  • Beyond the report, AVILOO has begun selling a Europe battery warranty tied to its test results and will update the ranked dataset twice a year, making the study a likely reference for used‑car pricing, fleet risk and insurance decisions.