Identifier persistence across lifecycle: keeping one battery traceable from placing to treatment

Identifier persistence means that the unique identifier assigned to a battery at production remains the key to its record through every later event: sale, installation, use, repair, change of holder, preparation for re-use, repurposing, remanufacturing and treatment as waste. Persistence is what makes a life record possible. Without it, each event creates a fragment, and fragments cannot be joined into a history with confidence. With it, a recycler at end of life can reach the same record that a repairer reached years earlier, and can see the same identifier, the same model and the same history, updated to the latest entry.

Persistence is a system property, not a property of the code printed on the battery. The code can be reprinted. The identifier must persist.

Why does persistence matter for second life decisions?

A second life decision, whether to repair, repurpose or recycle a battery, depends on history. A battery with a complete, persistent history can be assessed on evidence: state of health sequence, repairs, status changes, and the conditions under which measurements were taken. A battery with a broken history, where the identifier changed without linkage or where history was split across two records, cannot be assessed on evidence. The assessor must then rely on inspection and testing alone, without the context that history provides, or must decline to assess. Persistence therefore has economic and environmental consequences, not only administrative ones. A system that breaks persistence at the point of sale, by issuing a new identifier for a new holder, destroys the very history that makes second life assessment possible. Holder changes must be recorded as holder events under the same identifier, not as new identities.

How is persistence maintained through holder changes?

Holder changes are recorded as dated events in the unit history, with the prior holder type and the new holder type where the system records holder information, and with the date of the change. The identifier does not change. The model layer does not change. The unit history gains an entry. Where holder information is personal data, the record system must handle it under the applicable data protection rules, showing only the holder information that the tier and the purpose allow. The principle remains: the battery keeps its identifier, the history keeps its order, and the holder event is visible to authorised readers who need it. A holder change recorded without a date cannot be ordered. A holder change recorded by creating a new record creates a false impression that a new battery has entered the system.

How is persistence maintained through repair and repurposing?

Repair maintains persistence by keeping the identifier and adding a repair entry. Repurposing maintains persistence by keeping the identifier and adding a status entry that records the new application in general terms, the assessment relied on, and the date. Remanufacturing is the exception that tests the rule: where a new placing on the market occurs and a new identifier is required, persistence is maintained by linkage, not by identity. The new record links to the prior identifier and the prior record, and the prior record links forward to the new identifier where the system provides for forward linkage. A reader who reaches either record should be able to reach the other. Linkage must be recorded at the time of the new placing, not reconstructed later from memory or from matching values. Reconstruction is error prone, because values can match by coincidence and because similar batteries can share model values.

What breaks persistence?

Persistence breaks in four common ways. First, a new identifier is assigned without linkage, splitting history. Second, a data carrier is replaced with a carrier encoding a different identifier, because the replacement was generated from a template rather than from the original record. Third, a record system migration creates new identifiers for existing batteries, without a migration map that links old to new. Fourth, a battery is rebranded or relabelled for a new market, and the new label carries a new identifier that is presented as the original. Each break has the same remedy in principle: restore the link, record the break and the restoration, and verify that history is complete on both sides of the break. A break that is not detected is worse than a break that is detected and recorded, because an undetected break leads a reader to treat a partial history as complete.

What does the persistence checklist cover?

What limits apply to persistence claims?

Persistence claims state that history for one battery can be followed under one identifier or a linked chain of identifiers. Persistence does not guarantee that history is complete, because events that were never recorded cannot be recovered by an identifier. A persistent identifier with an empty history is a key to an empty room. Completeness requires event recording as well as identifier discipline. This guide gives general educational information only and does not give legal advice for a particular battery, system or lifecycle event.