Reading a Passport Before Buying a Used Battery

Reading a passport before buying a used battery means working through the record in a fixed order, so that identity is confirmed, dates are understood and performance figures are read last, in context. The order matters because a performance figure for the wrong battery, or a recent figure read as if it described the present battery when it describes an earlier date, misleads more than no figure at all. A buyer who follows the order can state, for each conclusion, which entry supports it and which entry limits it, which is the minimum that a purchase file needs.

The guide is written for a buyer of a used battery that falls within Article 77, namely an electric vehicle battery, a light means of transport battery or an industrial battery over 2 kWh placed on the market or put into service from 18 February 2027. For batteries outside that duty, the same reading order can be applied to any voluntary record, but the buyer should not expect the Annex XIII structure or the access tiers to apply. The position is stated as checked on 28 October 2026.

What is the first thing to check in the record?

The first check is identity, comparing the unique battery identifier in the passport with the identifier associated with the physical battery, and comparing the model identifier, category and chemistry with the battery and any accompanying specification. Identity comes first because every later reading assumes that the record describes the battery being bought. A buyer who starts with performance figures risks building a careful analysis on the wrong battery. Where the identifiers do not match, the purchase discussion should pause until the mismatch is explained, because a plausible explanation, such as a replacement battery with its own record, is common, but an unexplained mismatch leaves the record unusable as evidence for that battery.

How are dates read in the record?

Dates are read as the backbone of the record, because each entry describes the battery at the date of that entry and no entry describes the battery at a later date. A buyer should list the date of first placing on the market, the dates of later entries and the date of the newest entry, and should note any period with no entries. The newest entry sets the limit of the record, and anything that happened after that date, including use, storage, damage or repair, sits outside the record until a new entry is made. A record whose newest entry is months old is not necessarily a bad record, but a buyer should treat it as a record of the past and arrange a current check for the present.

What do the public fields show a buyer?

The public fields in Annex XIII show model and individual information intended for general access, including manufacturer identity, model identifier, category, chemistry, capacity and related model facts, together with carbon footprint, recycled content and end of life information at model level. Those fields let a buyer confirm what kind of battery is being bought and what its stated characteristics are, without needing a technical role. The detailed composition, dismantling information and safety measures sit in the legitimate interest tier, and test reports sit in the authority tier, so a buyer should not expect the public view to answer dismantling or compliance test questions. The tier structure is a feature of the Regulation, not a defect in a particular record.

What does a buyer reading table look like?

A buyer reading table turns the fixed order into a checklist that can be completed at the point of purchase and kept in the purchase file. The table below sets out the order, the question at each step and the entry that answers it, using general record states rather than a claim about any particular battery. A completed table is more useful than a general impression, because a later reader can see exactly which steps were checked.

What should a buyer ask when the record is thin?

When the record is thin, a buyer should ask for the documents that sit behind the record, including the invoice or contract for the last transfer, any state of health evaluation, and any repair or refurbishment documentation, and should ask when the record was last updated and by whom. The questions should be specific and dated, so that the answers can be recorded and checked. A thin record is not automatically a reason to walk away, and a thick record is not automatically a reason to proceed, because thinness can reflect a young battery, a voluntary record or a record system change, while thickness can reflect many entries of low value. The buyer needs the reason for thinness, not only the fact of thinness.

How does a buyer handle a record that disagrees with the battery?

A disagreement between record and battery, whether in identifier, category, chemistry or capacity, should be treated as an open question that blocks reliance on the record until resolved. The buyer should record the disagreement precisely, ask the seller for an explanation and supporting documents, and seek an independent check where the explanation is unclear. Possible explanations include a replacement battery, a record error, a labelling error or a data entry error, and each has a different remedy and a different implication for the purchase. A buyer who proceeds despite an unresolved disagreement should record that choice and the reason for it, because a later reader will otherwise assume that the record was accepted without question.

What limits apply to a buyer reading?

The limits are access, currency and scope, and a buyer reading should state all three in the purchase file. This guide gives general educational information only and is not individual legal advice. A buyer with a specific purchase should check the Regulation text and any applicable national rules as checked on 28 October 2026 before acting.