EV Battery Degradation Calculator
Estimate your electric vehicle battery capacity after years of use.
Calculate remaining range as the battery degrades over time.
EV batteries degrade over time and with use. Modern lithium batteries degrade much more slowly than early EV batteries, and most manufacturers guarantee at least 70% capacity over 8 years or 160,000 km.
Degradation model: Modern EV batteries typically lose capacity at two rates:
- First 2 years: ~2–3% per year (faster initial settling)
- Years 2–10: ~1–1.5% per year
- Practical average: ~1.5–2% per year over 10 years
Tesla data (large fleet): Tesla batteries show ~10% degradation over the first 150,000 km for most vehicles, then slow significantly.
Factors that accelerate degradation:
- Frequent DC rapid charging (especially above 80%)
- Charging to 100% regularly (should charge to 80–90% for daily use)
- Storing at high or low charge states
- Operating in extreme heat (>40°C) without thermal management
- Deep discharge to 0%
Factors that minimise degradation:
- Charging to 80–90% for daily use
- Keeping battery between 20–80% state of charge
- Pre-conditioning battery before charging in cold weather
- Using a home wallbox at 7 kW rather than rapid DC charging daily
Worked example: 75 kWh battery (10% initial degradation at 150,000 km): After 150,000 km: 75 × 0.90 = 67.5 kWh remaining Original range 450 km → remaining range: 405 km