The EV Tipping Point: Battery Longevity
Understanding battery degradation helps plan EV ownership and resale.
Ready to run the numbers?
Why: Battery degradation affects range and resale value.
How: We model calendar and cycle aging with charging and climate factors.
Run the calculator when you are ready.
🍩 Remaining vs Degraded Capacity
📊 Capacity Over 10 Years
📈 Remaining Range Over 10 Years
For educational and informational purposes only. Verify with a qualified professional.
EV battery degradation depends on calendar aging (time), cycle aging (miles driven), charging habits, and climate. Most EVs retain 70-80% capacity at 8-10 years with proper care.
Key Takeaways
- • Calendar degradation: ~2% per year × climate factor (Mild=1.0, Hot=1.3, Cold=1.1)
- • Cycle degradation: cycles × 0.0002 × charging mult × level mult
- • Charging: L2=1.0, Mix L2/DCFC=1.15, Mostly DCFC=1.35
- • Charge level: 20-80%=0.8, 10-90%=1.0, 0-100%=1.3
How the Math Works
Total degradation = 1 − (1 − calendarDeg) × (1 − cycleDeg). Remaining capacity = (1 − totalDeg) × 100. Replacement cost ≈ $130/kWh.
Frequently Asked Questions
How fast do EV batteries degrade?
Typical degradation is 2-3% per year from calendar aging. Cycle aging adds 0.02-0.05% per equivalent full cycle depending on charging habits.
Does fast charging hurt the battery?
Yes. Mostly DCFC can add 15-35% to cycle degradation vs home L2. Mix of L2 and DCFC adds ~15%. Occasional DCFC is fine.
What charge level is best for battery life?
Keeping between 20-80% minimizes stress. 0-100% regularly can add 30% to cycle degradation. 10-90% is a middle ground.
Does hot climate accelerate degradation?
Yes. Hot climates (e.g., Arizona) can add 20-30% to calendar degradation. Cold adds ~10%. Mild climates are gentlest.
What does battery replacement cost?
Current pack replacement runs ~$130/kWh. A 75 kWh pack is ~$9,750. Prices are falling as production scales.
When should I replace my EV battery?
Most EVs retain 70-80% capacity at 8-10 years. Replacement is typically when range becomes impractical for your needs, not a fixed threshold.
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