Repaired battery record: keeping the original passport accurate after a repair

A repaired battery is a battery that has been restored to working order after a fault, damage or failure of a component, for continued use in its existing application. Repair does not normally create a new placing on the market and does not normally require a new passport. The original unique identifier persists, the original model layer remains, and the unit layer gains a dated repair entry. The purpose of the repair entry is narrow and important: to show what was done, when, by what type of actor, and with what effect on the battery as recorded, so that a later reader does not mistake the repaired battery for an untouched battery.

What distinguishes a repair entry from a status change?

A repair entry is a kind of status entry with additional detail. The status change records that the battery moved from faulty or damaged to repaired. The repair entry records the operation behind that move: the fault or damage as described in the repair record, the components replaced or the software changed, the tests performed after repair, and the resulting state of health or performance measurement where one was taken. A status label alone, without operation detail, leaves a later repairer or recycler without the facts needed to work safely on the battery. A repair entry that lists a replaced part without a part identifier or a software change without a version reference is partly present, and the diagnosis should say so. The entry should reference the repair record held by the repairer, without reproducing restricted detail in a tier where it does not belong.

Which repairs affect the record most?

Repairs that replace cells, the battery management system, or structural components affect the record most, because they can change performance, safety characteristics and dismantling detail. A cell replacement can change the effective capacity and the balance of the pack. A battery management system replacement or software change can change state of health calculation, safety behaviour and the software reset position for EV batteries. A structural repair can change weight, dimensions or fastening detail. Each of those effects must be visible in the unit history, with a measurement or a statement of effect where the repairer recorded one. Repairs that replace only an external connector, a label or a housing fastener affect the record less, but the repair entry should still record the fact, because cumulative minor repairs can matter for a later assessment. The test is not the size of the repair. The test is whether a later reader would need to know.

How is a repair entry written?

A repair entry is written in factual, dated form. It states the date, the actor type, the fault or damage as recorded, the work performed, the parts or software affected, the tests performed, and the outcome. It states the state of health or performance value after repair where measured, with reference conditions, and states that no measurement was taken where that is the position. It does not state that the battery is as new, fully restored or safe for a new application unless the repair record and testing support that statement in those terms. The table below shows the shape of an entry. Labels are illustrative, not events for a real battery.

What happens to safety and dismantling information after repair?

Safety and dismantling information in the model layer remains the information for the model as originally placed, unless the repair changes the configuration in a way that makes that information inaccurate for this unit. Where a repair changes cell layout, fastening, wiring or the battery management system, the unit record should flag the mismatch, so that an authorised reader does not rely on model dismantling detail that no longer describes the unit. The flag does not rewrite the model layer for all units. It marks this unit as differing from the model description in a stated respect, with a reference to the repair record. A repairer who creates such a mismatch and does not flag it leaves a safety risk for the next person who opens the pack. A reader who sees a flag should seek the repair detail before dismantling.

How are repeat repairs recorded?

Repeat repairs are recorded as separate dated entries, in sequence, so that a pattern can be seen. A second repair for the same fault, a repair that follows an earlier repair within a short period, and a repair that replaces a part already replaced before are all facts that a later reader needs. The record should not merge repeat repairs into a single entry, and should not overwrite the earlier entry with the later one. Each entry carries its own date, actor type, work performed and outcome. A sequence of repeat entries does not by itself prove a defect in the battery or in the repair, and the record should avoid drawing that conclusion. The sequence does support a decision to seek inspection, testing or assessment, and that is the proper use of a repair history. Cumulative repair information is part of the unit history that Annex XIII point 4 contemplates, and completeness of that history is a quality test for the record as a whole.

What should a reader not infer from a repair entry?

A repair entry does not prove that the battery will perform as originally specified, that remaining life has been restored, or that the battery is suitable for a different application. Those conclusions require testing, assessment and, where applicable, a new declaration for a new placing. A repair entry also does not prove that no other fault exists. It proves that a stated repair was recorded on a stated date. A buyer, a repairer or a recycler who relies on a repair entry alone, without inspection or the underlying repair record, relies on a summary. This guide gives general educational information only and does not give legal advice for a particular battery, repair or transaction.