Second life safety checks

Second life safety checks are the inspections and tests applied to a battery, module, or pack before it enters a new application, to decide whether the unit is safe for that application and under what conditions. The checks cover visible damage, swelling, leakage, connector and enclosure condition, electrical insulation, battery management system function, and thermal behaviour, as relevant to the unit and the new application. EN 18061:2025 sets steps, conditions, and protocols for safe repair and reuse and preparation for repurposing of EV batteries, and IEC 63338 gives general guidance on reuse and repurposing of secondary cells and batteries. The record must state each check, the result, the tester, and the date, and must state the acceptance decision that followed.

A second life safety check means an inspection or test applied to assess whether a used battery is safe for a stated new application. The scope covers checks before reuse, repurposing, and remanufacturing, for the unit and application stated.

What is the legal frame for this stage?

Second life safety checks is not a single event at the end of a battery life. Articles 12 and 73 should be read with the definitions in Article 3, because the category of the battery decides which collection and treatment duties apply. A tester inspecting EV modules before stationary repurposing needs to know the category before any other check, since a portable battery, an LMT battery, an EV battery, and an industrial battery follow different routes. A module with a dented enclosure and a history of high temperature exposure should be held for further inspection and testing, and the hold decision should be recorded with the reason, rather than passed on the basis of a capacity test alone.

How are handovers recorded?

For second life safety checks, the handover record should also state the condition of the battery, the reason for transfer, and any safety information passed with it. Inspection notes, test results, and the acceptance decision should be retained for each transfer, including consignment notes where waste law requires them. A tester inspecting EV modules before stationary repurposing should check that quantities at receipt match quantities at dispatch, allowing for the measurement method stated in the record.

How are targets stated and checked?

For second life safety checks, the relevant target may be a collection rate, a recycling efficiency rate, or a material recovery rate, and each target has its own calculation method, reference period, and chemistry scope. A safety check that passes a unit for one application does not pass the unit for every application, and the record should state the application, the conditions, and any limits on use that follow from the checks. A tester inspecting EV modules before stationary repurposing should record the source of each figure and the date on which the figure was checked, using a dated snapshot where a figure can change.

How are safety and classification decided?

Second life safety checks may involve a battery that is damaged, swollen, leaking, or otherwise in a condition that changes handling, and the record should state the condition found, the test or inspection applied, and the decision that followed. A module with a dented enclosure and a history of high temperature exposure should be held for further inspection and testing, and the hold decision should be recorded with the reason, rather than passed on the basis of a capacity test alone.

What belongs in the passport entry for this stage?

For second life safety checks, the entry should show the stage reached, the operator responsible at that stage, the date of the stage, and a reference to the underlying evidence, without adding a claim about a later stage that has not happened. Inspection notes, test results, and the acceptance decision should be linked by identifier, so the passport entry, the handover note, and the treatment record refer to the same battery. A tester inspecting EV modules before stationary repurposing should check that the passport entry is updated when the stage changes, and that an earlier entry is preserved in version history rather than overwritten without trace. A safety check that passes a unit for one application does not pass the unit for every application, and the record should state the application, the conditions, and any limits on use that follow from the checks.

What stays open, and how is it followed up?

For second life safety checks, open items may include a missing handover note, a pending test result, a facility report not yet received, or a delegated act not yet published that will set a method or a format. A tester inspecting EV modules before stationary repurposing should list each open item, name the owner, and give the next review date. A module with a dented enclosure and a history of high temperature exposure should be held for further inspection and testing, and the hold decision should be recorded with the reason, rather than passed on the basis of a capacity test alone.

How is an acceptance decision recorded for one module?

An acceptance decision for one module is recorded as a checklist with a result for each check, a decision, and a signature. The checklist shows visual inspection, insulation test, capacity test, temperature history, and fault history, each with a result and a date. A worked record for a module shows four passes and one query on a connector, the query resolved by a retest, and an acceptance for stationary use with a stated power limit. The decision names the application, the conditions, and the reviewer. A module with a failed insulation test is recorded as rejected, with the reason and the recycling route, and the rejection is not softened by a passed capacity test in the same record.

Safety is decided check by check, and a single passed test does not cancel a failed inspection elsewhere in the same unit.