Free during beta
Enter a VIN to see what’s normal for this car, plus recalls, warranty and replacement cost. Add a dash reading for a car-specific estimate. Sellers can verify the actual battery.
Free during beta · No account needed · Methodology published
Example
Estimated + dash reading
2021 Tesla Model 3 Long Range · 110,000 km
About 10.9 points under similar cars
Normal range 86.9–94.9%
Worth negotiating
$1,400–$1,700
10.9 pts × 2023 published estimate
Covers drops below 70% until 2029 or 160,934 km. At ~80%, this battery wouldn't qualify today.
Source: AVILOO, 2026
Example only.
Why check
Buying
Ask the seller for a verified report.
Selling
Examples
See what a report looks like before you check a car.
Sample
Estimated
What’s normal
Expected band
92–100%
Sample
BEstimated + dash reading
Dash reading
93%
Range 83–100% · Rough
Sample
DConnected
Connected
More wear than similar cars — room to negotiate
Open simulated sample cars. Those readings come from a Smartcar simulated connection. They are samples, not your vehicle.
How it works
First, what’s normal for this model. Then, how healthy this car is — each step narrows the range.
We identify the car from the 17-character VIN.
The comparison is cars of the same model, age, and mileage.
Expected health for this model, recalls, warranty and replacement cost. Add a dash reading or a battery test for a reading of this car.
Question 1 · free
Enter the VIN and mileage
Similar cars: 92–100%
Not a reading of this car
Question 2 · how healthy is this car?
Type the range and battery % shown
Rough · ±10 pts
Owner links the car’s account
Good
Most accurate
Battery test at a partner shop
Precise · narrowest
Method
How the grade, percentile and dollar range are built.
Health is compared with cars of the same model, age, and mileage.
The dollar figure covers only fade beyond what’s normal for similar cars. It’s shown as a range, and it’s $0 when the car is at or above normal.
The badge says whether the number was measured on a scan tool, read from a connected account, or estimated from the VIN and a typed dash range.
Benchmarks: published studies covering hundreds of thousands of battery tests, cited on every report. Sources.
We’ll publish error rates for each battery type once 20 or more cars of that type have been tested against a reference measurement.
Coverage
Popular EVs, plug-in hybrids and hybrids.
For shops and dealers
Offer measured battery reports to buyers. We supply the software and the report.
Become a partnerShow buyers a report they can verify.
See dealer optionsHelp
It identifies the car and shows what battery health is normal for that model at its age and mileage, using published studies, plus battery recalls, warranty status and replacement cost. It doesn’t test this car’s battery; for that, add a dash reading or connect the car.
You can find typical numbers for a model. What you can’t get elsewhere is a reading from this specific car’s battery that a seller can share and a buyer can verify. The free check is the starting point; connected and measured reports are where it gets specific.
It turns a model-level estimate into a rough reading of this car. Take the range and battery % at the same moment, at 40% charge or higher. Dash range depends on recent driving, so the result is shown as a wide range.
Published studies of real-world battery tests and fleet data, listed with links on our methodology page. Every report names the sources it used.