Comparing two used internal combustion cars often comes down to mileage, year, and maintenance history. For a used electric car, one additional parameter changes everything: the actual condition of the battery. Without this data, two identical models on paper can show radically different ranges, and therefore incomparable market values.
Battery health: the missing criterion in most listings
The SoH (State of Health) measures the residual capacity of a battery compared to its new state. An electric vehicle with a battery that retains high capacity will offer a range close to its original specification. Another example of the same model, with degraded SoH, will lose several dozen kilometers of actual range.
The display of SoH in used vehicle listings remains voluntary and is not yet mandatory for all sellers. As a result, buyers often have to request a diagnosis themselves or rely on rough estimates. This creates an information asymmetry that specialized platforms like yakar.fr are beginning to address by better structuring the technical data available for each vehicle.
Without this criterion, comparing two used electric cars at the same price makes little sense. One may be worth its price, while the other could be overvalued by several thousand euros.
Battery warranty and transfer to the second owner: what varies by brand
Most manufacturers offer a battery warranty covering several years or a high mileage threshold, with a commitment to a minimum capacity level. The trap is to consider this warranty as automatically transferable.
The transfer of warranty to the next owner depends on the specific conditions set by each manufacturer. Some brands require a visit to an authorized dealership to validate the transfer. Others require that maintenance has been performed within their network. Still others limit coverage in the event of resale between private individuals.
- Check the date of first registration, as the warranty often starts from this date and not from the date of used purchase.
- Ask the seller for proof of maintenance within the authorized network, which is a common condition to maintain coverage.
- Compare the guaranteed capacity threshold: it generally revolves around a minimum percentage, but this threshold varies from one manufacturer to another.
A buyer who neglects these checks risks finding themselves without recourse in the event of premature battery degradation.
European battery passport: transparency is coming
The future European battery passport aims to centralize the technical information of each battery in an accessible digital register. This regulatory evolution will change the conditions of purchasing used cars for electric models.
This passport will notably include the charging history, certified residual capacity, and any technical interventions. The buyer will be able to compare two batteries on a standardized basis, which is not possible today without independent diagnosis.
Used vehicle search sites do not yet incorporate this dimension. Listings remain constructed on the same criteria as for internal combustion vehicles: price, mileage, year, equipment. The battery passport should force a redesign of product sheets in the coming years.
Prices of used electric vehicles: an unstable market to watch
Sales of used electric cars surged in 2025. However, the available stock contracted in 2026, leading to a rise in prices after the decline observed the previous year. This volatility makes the timing of purchase more strategic than for an internal combustion vehicle.
| Criterion | Used internal combustion vehicle | Used electric vehicle |
|---|---|---|
| Main comparison criterion | Mileage, maintenance, general condition | Battery SoH, charging history |
| Transparency of listings | Standardized data (CT, maintenance book) | SoH rarely displayed |
| Transferable warranty | Variable but well-defined | Specific conditions by brand |
| Price evolution 2025-2026 | Relatively stable | Drop then rise (reduced stock) |
| Specific purchase assistance | No dedicated assistance | New assistance available under conditions |
New assistance may support the purchase of a used electric car, which changes the calculation for buyers attentive to the overall budget. The displayed price does not reflect the actual cost without considering the condition of the battery and available assistance.
Effectively filtering your online used vehicle offer
Beyond the type of engine, searching for a used vehicle online becomes more efficient when filters go beyond the classic criteria. A good search tool allows you to cross-reference the engine type, budget, location, and, for electric vehicles, the announced battery capacity.
- Favor listings that explicitly mention the SoH or a recent battery diagnosis for electric models.
- Cross-check the asking price with the updated valuation, as the volatility of the used electric market makes valuations from a few months ago obsolete.
- Check if the professional seller offers a warranty specifically covering the battery, separate from the standard mechanical warranty.
The wide choice of used vehicles available today does not exempt one from a rigorous method. For an internal combustion model, the technical inspection and maintenance book remain reliable benchmarks. For an electric model, these documents are not enough: the condition of the battery is the true indicator of value.
The used car market is undergoing a transition phase. Buyers who integrate the specific criteria for electric vehicles, from SoH to warranty transferability, will make better decisions than those who rely solely on the usual parameters. The European battery passport will help structure this transparency, but until then, individual vigilance remains the best filter.
