Battery Health & Resale Calculator
Estimate your EV battery's current health, predict future degradation, and calculate accurate resale value based on real-world data.
Calculate Battery Health & Value
Understanding EV Battery Health
Charging Habits
Frequent DC fast charging can accelerate degradation by 10-15%. Home charging at 80% SoC is optimal for battery longevity.
Temperature Impact
Extreme heat (40°C+) or cold (-20°C) can increase degradation by up to 3x. Thermal management systems help protect the battery.
State of Charge
Keeping battery between 20-80% extends lifespan. Avoid leaving at 100% or near 0% for extended periods.
EV Battery Lifespan by Manufacturer
| Manufacturer | Warranty | Expected Lifespan | Avg. Degradation |
|---|---|---|---|
| Tesla | 8 years / 192,000 km | 15-20 years | 1.5-2%/year |
| BYD (Blade) | 8 years / 160,000 km | 15-20 years | 1-1.5%/year |
| Hyundai/Kia | 8 years / 160,000 km | 12-15 years | 2-2.5%/year |
| Volkswagen | 8 years / 160,000 km | 12-15 years | 2-3%/year |
| Nissan Leaf | 8 years / 160,000 km | 8-12 years | 3-5%/year |
✅ Best Practices for Battery Health
- • Charge to 80% for daily use, 100% only for long trips
- • Use slow/Level 2 charging when possible
- • Park in shade during hot weather
- • Pre-condition battery before DC fast charging
- • Keep software updated for optimal battery management
⚠️ What Accelerates Degradation
- • Frequent DC fast charging (especially above 80%)
- • Leaving battery at 100% or near 0% for days
- • Exposing to extreme temperatures regularly
- • High-power acceleration when battery is cold
- • Ignoring thermal management system issues
Frequently Asked Questions
How long do EV batteries really last?
Modern EV batteries are designed to last 10-20 years or 300,000+ km. Most manufacturers guarantee at least 70-80% capacity after 8 years. Tesla batteries have shown only 12% degradation after 200,000 miles in real-world studies.
Should I worry about battery replacement costs?
Battery replacement costs have dropped 80% since 2013 and continue to fall. In 2026, expect $100-150/kWh, meaning a 75kWh battery costs $7,500-11,250. However, most owners never need replacement within typical ownership periods.
How does battery health affect resale value?
Battery health is the #1 factor in EV resale value. A car with 90% battery health typically retains 10-15% more value than one with 80% health. Providing battery health reports can increase buyer confidence and sale price.
Can I check my actual battery health?
Yes! Use manufacturer apps (Tesla app, MyHyundai, etc.), OBD2 scanners with EV-specific software (like Leaf Spy for Nissan), or request a battery health report from dealerships. Some third-party services also offer independent battery assessments.