A buyer’s checklist for battery passport information.

Ask what actually exists

Start by asking whether the seller has a passport record for the installed battery, where it is held and which information they can share. Do not assume an older car has one simply because a regulatory start date has passed.

Cross-check the record with the car

Match the battery identity, model and relevant dates to the documents. If a pack has been replaced, ask which record describes the replacement. A digital record associated with the original pack may not answer your questions about the current one.

Keep a list of open questions

Does the record identify the installed battery?
Which values are specifications and which are updated observations?
What method produced any condition figure?
Are dates, units or fields missing?
Which information still needs a qualified inspection?

Use it alongside the other evidence

Combine the record with the service history, original warranty terms, charging demonstration and a suitable diagnostic report. Avoid merging all of those into a single unexplained score. Use the Used EV Analyzer to organise supplied numbers while leaving uncertain facts visible.

Keep three separate evidence columns at the viewing

Use one column for original specifications, one for dated observations and one for unanswered questions. A passport may contribute to the first two, depending on the field, source and access available. It does not automatically eliminate the third.

If the seller has no accessible passport, ask for the conventional evidence available for that car: vehicle documents, warranty terms, service and repair records, and a relevant battery assessment. Do not invent a passport or assume the absence of a record proves a battery fault. Review applicable scope in the framework guide rather than assuming every older EV must have the same digital record.