Used EV tools · US
Used EV battery health & range checker
Estimate how much battery capacity a used electric car has likely lost, what that means for real-world EPA range in summer and winter, and how much manufacturer battery warranty is left. All figures in miles for the United States.
health
Estimated battery health
Healthy for its age
A 2021 Acura ZDX on 42,000 miles, charged as “Mostly home AC charging”, would typically hold around 85.6% of its original usable capacity — roughly 45 miles off the original EPA figure.
Green ≥ 85% · Amber 75–84% · Red below 75%.
Summer range
267 miles
Typical 65°F to 75°F conditions, mixed driving.
Winter range
183 miles
25°F to 35°F with cabin heating — around a 28% drop. This is the number that decides whether a used EV works for you.
Battery warranty: Active
Federal battery warranty minimum: 8 years / 100,000 miles
Around 29 months and 58,000 miles of cover remain, whichever runs out first. US cover normally pays out only if health falls below 70%, and salvage or rebuilt titles are excluded.
3-year degradation forecast
Assuming 12,000 miles a year and the same charging habits.
US used EV inspection checklist
What to check before you hand over any money on a used electric car in the United States.
How honest is this? These figures come from a published-average degradation model — roughly 2.2% capacity loss a year plus 0.8% per 10,000 miles, adjusted for charging habits. Real packs vary widely by chemistry, climate and how the car was treated, so always confirm with a diagnostic state-of-health reading before buying. Nothing here is a battery scan, and What EV carries no affiliate links.