Is that used EV's battery healthy?
Typical battery state of health (SoH) for popular used electric cars, by mileage and age – compiled from independent tests and real-owner data, with a source and date for every number.
57% of potential UK used-EV buyers say they would not buy without an independent battery check (Startline Motor Finance, 2026-08-17). This site shows what "normal" looks like so you can judge a test result.
Models covered (12)
Nissan Leaf
Tesla Model 3
Tesla Model Y
Hyundai Kona Electric
Hyundai Ioniq Electric
Hyundai IONIQ 5
Kia e-Niro / Niro EV
Kia EV6
Volkswagen ID.3
Volkswagen ID.4
BMW i3
Renault Zoe
Battery health by age – UK, all models
| Age (years) | 25th pct | Median | 75th pct |
|---|---|---|---|
| 0–1 | 97.9% | 100.0% | 100.0% |
| 1–2 | 97.2% | 99.3% | 100.0% |
| 2–3 | 95.0% | 96.9% | 99.9% |
| 3–4 | 93.0% | 95.2% | 98.2% |
| 4–5 | 91.6% | 93.5% | 96.5% |
| 5–6 | 89.0% | 92.3% | 96.0% |
| 6–7 | 88.1% | 90.8% | 93.5% |
| 7–8 | 88.0% | 90.0% | 93.9% |
| 8–12 | 82.0% | 85.0% | 90.0% |
UK, all models combined (BEV + PHEV, cars + vans), tested in 2025. Average SoH across all vehicles: 95.15%. In 4–5-year-old vehicles the lowest-performing 1% fell to 80.76%. Source: Generational (2026-02).
Battery health by mileage – all models
Swedish dealer data (Carla, 9,954 tests): 98.6% at up to 10,000 km, 94.4% at 50,000 km, 92.4% at 100,000 km (Carla AB, 2026-06-26). ADAC's rule of thumb for a healthy battery: ≥92% at 50,000 km, ≥88% at 100,000 km, ≥84% at 150,000 km, ≥80% at 200,000 km (ADAC).
Average degradation 2.3% per year across 21 make-models (2025 analysis of 22,700 fleet EVs); light cars averaged 2.0%/year, MPVs/light vans 2.7%/year; 8 of 11 established models from the 2023 dataset stabilised at 1.4%/year. (Geotab).
Compare 20 models side by side →
FAQ
How much battery capacity does a used EV lose?
Less than many buyers fear, but it varies a lot. In UK data from Generational (2025 tests, all models) the median SoH was 93.5% for 4–5-year-old cars and 85.0% for 8–12-year-old cars. Geotab's fleet data shows an average loss of 2.3% per year.
Is the dashboard battery figure reliable?
Not always. Independent tests (e.g. AVILOO) calculate SoH themselves rather than relying on the car's own battery management system, and results can differ by a few percentage points depending on method.
Where does your data come from?
Published independent test datasets (AVILOO, Generational, Swedish dealers Carla and Riddermarks), long-term tests (ADAC), manufacturer statements and, increasingly, owner contributions. Every figure links to its source and date.
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