EV Battery Degradation Calculator
Estimate remaining battery capacity and range reduction for an electric vehicle based on age and usage pattern.
Results
What is it?
EV battery degradation is the gradual reduction in a lithium-ion battery's maximum charge capacity over time and charging cycles. It follows a roughly exponential decay pattern � faster in the early years, slowing as the battery ages. Capacity loss directly translates to reduced driving range.
How to use
Enter the vehicle's original EPA-rated battery capacity, its age in years, and select a degradation scenario. "Optimal" reflects ideal charging habits (20�80% SoC, moderate temperatures, slow charging). "Heavy use" reflects frequent DC fast charging, extreme temperatures, and high SoC storage.
Example scenario
A 5-year-old EV with a 75 kWh pack degrading at the average rate of 2.3%/yr: remaining capacity = 75 x (1 - 0.023)^5 = 75 x 0.891 = 66.8 kWh � a 10.9% loss. If the car originally offered 400 km of range, it now delivers approximately 356 km.
Pro tip
The single best practice to slow EV battery degradation is to keep state of charge between 20% and 80% for daily use, only charging to 100% before long trips. Avoiding frequent DC fast charging adds years to battery life. Many manufacturers offer battery health warranties (e.g. 70% capacity at 8 years / 100,000 miles) � check yours.