Battery Degradation
Definition
The gradual loss of an EV battery's maximum capacity over time and charge cycles. Most EV batteries retain 80–90% capacity after 8–10 years.
Why is Battery Degradation Important?
As electric vehicles transform transportation across the United States, understanding Battery Degradation is essential for making informed EV ownership decisions. Whether you are comparing models, planning road trips, or evaluating long-term savings, this concept directly impacts your EV experience and total cost of ownership.
Our EV calculators help you quantify these factors, enabling confident comparisons between electric and gas vehicles and optimizing your charging strategy for maximum efficiency and savings.
What is Battery Degradation?
Battery degradation is the gradual, irreversible loss of an EV battery's maximum capacity over time and charge cycles. All lithium-ion batteries degrade, but modern EV batteries are designed to last well beyond a decade with proper care.
Typical Degradation Timeline
| Age/Mileage | Typical Capacity Remaining | Range Example (originally 300 mi) |
|---|---|---|
| New | 100% | 300 miles |
| 2 years / 30K mi | 95-98% | 285-294 miles |
| 5 years / 75K mi | 90-95% | 270-285 miles |
| 8 years / 100K mi | 85-92% | 255-276 miles |
| 10 years / 150K mi | 80-90% | 240-270 miles |
| 15 years / 200K mi | 75-85% | 225-255 miles |
Factors That Accelerate Degradation
| Factor | Impact | Recommendation |
|---|---|---|
| Frequent DC fast charging | High | Use Level 2 as primary charging |
| Charging to 100% daily | Moderate | Charge to 80% for daily use |
| Extreme heat exposure | High | Park in shade, use battery cooling |
| Letting battery sit at 0% or 100% | Moderate | Keep 20-80% for storage |
| Aggressive driving | Low-moderate | Moderate acceleration when possible |