Used EV Battery Health Checker
SoH, range & a Buy / Caution / Pass verdict — from one number: the car’s current range at 100% charge. Free, no sign-up, no paywall.
EPA ranges shown are mid-range estimates per model (e.g. Model 3 272–358 mi, Model Y 260–330 mi, Leaf 149–226 mi, EV6 232–310 mi, Mach-E 230–320 mi, ID.4 240–291 mi). Actual rated range varies by trim, battery size and year — check the window sticker or EPA listing for the exact car.
Your result
— estimated SoH
- Expected range today
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- Your range vs EPA
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- Fleet benchmark SoH
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- Benchmark band
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- 70% warranty floor
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- Battery warranty left
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How to read this
Buy — SoH 85% or higher, near its benchmark
The battery is holding up well for its age. Still get a pre-purchase inspection and confirm the warranty status before paying.
Caution — SoH 70–84%, or well below its benchmark
The car works, but range is noticeably reduced. Negotiate the price down, confirm the battery warranty has time and miles left, and make sure the reduced range still covers your daily driving.
Pass — SoH below 70%
The battery is at or below the typical 70% warranty floor. Unless the car is nearly free and the warranty would cover a replacement, walk away.
Benchmark: Geotab’s 2026 fleet data shows average degradation of about 2.3% per year. Tesla Model 3/Y batteries retain roughly 85% capacity at 200,000 miles. Individual cars vary — fast-charging habits, climate and trim all matter. This is an estimate from range alone, not a diagnostic scan; a dealer or independent EV shop can read the battery management system for a precise SoH.
Frequently asked questions
What is a good SoH for a used EV?
85% or higher is good. Buy with confidence if the car also matches the fleet benchmark. 70–84% means caution: budget for reduced range and negotiate the price. Below 70% is a pass for most buyers, because the battery is near the typical 70% warranty floor.
How is SoH estimated from range?
SoH is estimated as current 100% range divided by the EPA rated range, then compared with the fleet benchmark of about 2.3% degradation per year (Geotab 2026). A car well below its age-expected benchmark is flagged even if its raw SoH looks acceptable.
What is the 70% warranty floor?
Most EV battery warranties cover 8 years or 100,000 miles and guarantee at least 70% of original capacity. If a battery drops below 70% inside that window, the manufacturer typically repairs or replaces it.
How much battery warranty is left on a used EV?
Subtract the model year from year + 8 for remaining years, and subtract the odometer from 100,000 miles for remaining miles. The warranty ends whichever limit is reached first. This checker shows both numbers.
Do the $7,500 new and $4,000 used EV tax credits still apply?
No. The federal $7,500 new-EV credit and $4,000 used-EV credit ended September 30, 2025, and are NOT counted in this checker’s verdict or any value judgement. Do not factor them into the price you pay.
Is a used EV with 80% SoH worth buying?
Maybe — at the right price. 80% SoH is in the Caution band: the car still works, but expect roughly 20% less range than new, check that it is not far below its age benchmark, and make sure the battery warranty still has time and miles left.