A public EV charging-transaction dataset shows why the used-EV shopping page needs a second filter. I checked a peer-reviewed dataset with 72,856 charging sessions from 2,337 EV users and 2,119 chargers, then compared it with used-EV battery-health guidance from Recurrent and Autotrader. Used listings still make mileage easy to sort, even though an EV’s future value depends heavily on battery condition, usable range, charging routine, and how confidently a buyer can verify those things. Mileage still is important. But for used EVs, mileage alone is a weak shortcut.
The surface story is the dataset. The real story is the used-EV listing page.
The Scientific Data paper behind this dataset is not a used-car pricing study. It is a charging-transaction dataset. The authors say it includes 72,856 sessions from 2,337 EV users and 2,119 chargers, collected during a commercial operation period. The dataset is designed for analysis from both the user and charger perspectives.
Used-EV buyers are still trained to think like gasoline-car buyers.
Lower miles usually mean less wear. Higher miles usually mean more risk. That logic still has some value. Tires, suspension, cabin wear, brakes, and general use still matter. But the most expensive component in an EV is not judged well by the odometer alone.
A 25,000-mile EV that sat at a high state of charge, used frequent DC fast charging, or lost meaningful usable range can be a worse buy than a 55,000-mile EV with a healthier battery and predictable charging history.
That is the missing layer.
What Torque News Checked
Torque News checked the original Scientific Data paper and ResearchGate listing for the EV charging-transaction dataset. The paper says the dataset contains 72,856 charging sessions, 2,337 EV users, and 2,119 chargers. It also says the file includes fields such as ChargingSessionID, UserID, ChargerID, charger company, location, charger type, charger capacity, AC/DC classification, start time, end time, duration, and demand.
Torque News also ran two simple calculations.
First, 72,856 sessions divided by 2,337 users equals about 31 charging sessions per user.
Second, 72,856 sessions divided by 2,119 chargers equals about 34 charging sessions per charger.
Those calculations do not tell us whether one specific used EV is healthy. They do show that charging behavior can be measured at scale, which is exactly the kind of missing evidence EV buyers need.
Torque News then checked the buyer side. Recurrent says it analyzes real-world miles and dozens of datapoints, including temperature, age, and charging patterns, to help buyers and sellers understand electric vehicles. Autotrader says checking a used EV battery’s health can involve range comparisons, diagnostic scans, and detailed reports.
Mileage is still useful. It is just not enough.
The odometer is easy to understand. That is why it became the default used-car filter.
But EVs change what mileage means.
In a gasoline car, mileage is a rough proxy for engine wear, transmission wear, maintenance risk, and resale value. In an EV, mileage still tells part of the story, but the battery adds a second value system. It is a showcase of how much usable range remains, how the battery was charged, how often it was charged, what temperatures it lived in, and whether the buyer can verify the pack’s current condition.
That is why mileage-only sorting can mislead a used-EV shopper.
A low-mile EV with no battery report may look safer than it is. A higher-mile EV with strong battery-health evidence may be the better buy.
The dataset shows why charging history deserves more attention
The charging dataset does not publish a Carfax-style resale score. It does something more basic: it shows that EV charging behavior can be recorded, structured, and analyzed.
The paper says the charging data was acquired through machine-to-machine communication, with charger information transmitted through an operating system and processed into session records. The authors also converted time-detection information into daily time-series data at 15-minute resolution for analysis.
That is important because a used-EV listing usually reduces the car to year, trim, mileage, price, accident history, and maybe range. But the EV itself has a richer life story.
- How often did it charge?
- Did it live on public DC fast charging?
- Was it mostly slow-charged overnight?
- Was it stored full?
- Does its current usable range match the listing claim?
- Does the battery report support the price?
Those questions are not niche. They are resale questions.
Battery confidence is becoming part of the price
Used EVs have a trust problem that gasoline cars do not have in the same way. A gas-car buyer can understand a high-mile engine risk even without being a technician. An EV buyer often has to trust a battery they cannot see.
Recurrent’s business exists because buyers, sellers, and owners want real-world EV health and value data beyond the odometer. Autotrader’s used-EV battery advice points in the same direction: buyers should assess battery health through multiple methods, not just assume the odometer tells the whole story.
That does not mean every used EV with higher mileage is risky. In many cases, the opposite may be true. The problem is not mileage itself. The problem is mileage without a battery context.
The practical consequence
If you are shopping for a used EV, do not sort only by mileage and price.
Ask for four things before you treat a low-mile EV as the better buy: a battery-health report, current usable range, charging-speed behavior, and warranty status. Then compare that with the car’s asking price.
A 30,000-mile EV with no battery evidence should not automatically beat a 55,000-mile EV with a strong battery report. The odometer tells you how far the car has gone. The battery evidence tells you how much EV is left.
About The Author
Noah Washington is an automotive journalist based in Atlanta, Georgia, covering sports cars, luxury vehicles, and performance culture. His reporting focuses on explaining the engineering, design philosophy, and real-world ownership experience behind modern vehicles.
Noah has been immersed in the automotive world since his early teens, attending industry events and following the enthusiast communities that shape how cars are built and driven today. His work blends industry insight with enthusiastic storytelling, helping readers understand not just what a car is, but why it matters.
Noah is also a member of the Southeast Automotive Media Association (SAMA), a professional organization for automotive journalists and industry media in the Southeast.
His coverage regularly explores sports cars, luxury vehicles, and performance-driven segments of the automotive industry, including the evolving culture surrounding Formula Drift and enthusiast builds.
Read more of Noah's work on his author profile page.
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