Second Hand EV Sale and the Battery Passport Record

A second hand electric vehicle sale does not create a battery passport, and the passport does not by itself prove the condition of a vehicle. The record that matters at sale is the individual battery record for the traction battery fitted to that vehicle, read together with the vehicle documents, so that identity, category, chemistry, capacity and recorded use information can be compared with the vehicle in front of the reader. Where the record and the vehicle agree, the sale discussion rests on a shared set of facts. Where the record and the vehicle disagree, the disagreement needs resolution before the sale proceeds.

The scope here is the traction battery of a road vehicle, classified as an electric vehicle battery under Regulation (EU) 2023/1542. From 18 February 2027 each electric vehicle battery placed on the market or put into service is required to have a battery passport under Article 77. Vehicles placed on the market before that date fall outside that fixed duty, and any record for an earlier battery is voluntary or contractual. The distinction between a passport required by Article 77 and an earlier voluntary record is central to this guide, and the position is stated as checked on 28 October 2026.

What record should be available at a second hand EV sale?

At sale, the record to ask for is the battery passport for the individual traction battery, reached through the data carrier on the battery, together with any accompanying documents that show the chain from first placing on the market to the present holder. The passport carries model information and individual information, including the unique identifier, and later use information where the system records it. A seller who can produce the record, the identifier match and the dated history gives a buyer a single chain to read. A seller who can produce only a summary, a screenshot or a verbal assurance leaves the buyer to reconstruct the chain from fragments, which is a weaker position even when the fragments are accurate.

How is the battery in the vehicle matched to the record?

Matching is an identity check before it is a condition check. The identifier in the passport is compared with the identifier associated with the battery fitted to the vehicle, and the model identifier, category and chemistry are compared with the vehicle specification. A match on all three points supports the conclusion that the record describes the battery in the vehicle. A mismatch on any point means that the record may describe a different battery, a replacement battery or a battery whose record has not been updated after a swap. Replacement is a legitimate event in the life of a vehicle, but a replacement without a linked record update creates a gap that a buyer should ask about before treating the record as evidence for the battery now fitted.

What does state of health information add at sale?

State of health information describes the recorded condition of that individual battery at the date of the entry, and it helps a buyer understand the recorded trajectory rather than a single moment. A single reading without a date, without a method note and without earlier readings is harder to interpret than a dated sequence, because the reader cannot tell whether the reading is recent, whether the method stayed constant or whether the trajectory is stable or falling. The Regulation places state of health and status information in the individual information part of Annex XIII, accessible to persons with a legitimate interest, which means that a buyer may not see every field that a repairer or recycler sees. The access limit does not make the public fields useless, but it does set a limit on what a sale reading can prove.

What does a worked sale reading look like?

A worked reading follows a fixed order, so that each step is checked before the next step is trusted. The illustration below uses a hypothetical vehicle and hypothetical record states, labelled as illustrative, to show the order of checks rather than to describe any real vehicle. The value of the illustration is the sequence, not the particular values.

What questions does the record leave unanswered?

The record does not answer questions about the rest of the vehicle, about driving history beyond what the battery record captures, about future performance or about the price that a particular vehicle should command. It also does not answer questions that fall outside its access tier, and a buyer who expects the public fields to answer a technical question reserved for legitimate interest holders will be disappointed. The right response is to treat the record as one evidence source among several, alongside inspection, service history and any independent test that the buyer commissions. A record that is silent on a point is not evidence that the point is favourable, and silence should be recorded as silence in any sale note rather than filled in by assumption.

How do sale documents and the passport fit together?

Sale documents and the passport serve different purposes, and each covers a weakness of the other. The passport gives a structured, identifier linked history for the battery, while the sale documents give the commercial facts of the transaction, including the parties, the date, the price and any warranties or statements made at sale. Article 73 shows the same pairing for batteries prepared for reuse or repurposing, where further use is documented by invoice or contract. A buyer should keep both together, because a later dispute about condition or identity will turn on what was recorded at the time, not on what either party remembers later. The pairing also helps a later owner, who inherits a file rather than a single document.

What limits apply to reading a record at sale?

The limits are access, date and scope. Access limits decide which fields a buyer can see. Date limits decide whether the newest entry is recent enough to describe the present battery. Scope limits decide whether the battery in question falls within Article 77 at all, since a vehicle placed on the market before 18 February 2027 may have no passport duty. This guide gives general educational information only and is not individual legal advice. A buyer or seller with a specific transaction should check the Regulation text and any applicable national rules as checked on 28 October 2026 before acting.