One document, four failure points
A battery test summary is short. It fits on a couple of pages, it is issued once for a configuration, and it is copied from buyer to forwarder to carrier with almost no scrutiny. That is exactly why it fails: the document is short enough that nobody checks it, and the four things that can be wrong with it are all visible on the page.
The checks below are mechanical. None of them requires a laboratory, and all of them can be done by a buyer in a few minutes with the summary, the carton artwork and the bill of materials on the desk. When one of the four fails, the fix is a new document from the supplier, not an explanation.
Check one: does the summary describe this model
Start with the identifier. The summary names a cell or battery model; the carton names a product model; the purchase order names a third thing, which is the commercial model. All three have to line up, and in practice they often do not, because a supplier may use one pack across several product models and print a single summary for the family.
That is acceptable only when the summary explicitly covers the pack used in your product. Read the description line and ask whether the pack in your bill of materials is the pack described. If the summary says a pack family name and your BOM says a specific part number, ask for the document that ties the two together. A cover letter from the supplier is weaker evidence than a summary that names the part.
The four checks, side by side
| Check | What to compare | Pass condition | Typical failure |
|---|---|---|---|
| Model match | Summary model, carton model, purchase order model | One pack part number appears in all three places | A family name on the summary, a part number on the carton |
| Cell to pack correspondence | Cell model in summary versus cell called out in the pack drawing | The cell is the one actually assembled | Cell substituted during a shortage |
| Test set completeness | The list of tests described in the summary | All required items are described, none marked pending | A test listed as "to be completed" |
| Version and validity | Issue date, revision, signatory | Current revision, dated after the last design change | An old revision reused after a change |
Check two: cell and finished pack correspondence
The summary usually describes tests on cells and tests on the finished pack as separate items. Both matter, because a pack built from a tested cell is not automatically a tested pack: the assembly, the protection circuit and the enclosure change the behaviour under abuse, and a pack that sits in a rigid battery compartment behind a heating element is in a different thermal situation from a bare pack on a bench. A summary that shows cell testing only, with no finished-pack result, is describing half of the configuration you are shipping.
The other half of this check is the cell's identity. Cell substitution is common during supply shortages, and a substitution is not necessarily a problem, but it does mean the summary in your file may describe a cell that is no longer inside the product. Compare the cell designation in the summary with the cell designation in the pack drawing, and ask for written notice of any substitution before shipment.
Check three: is the test set complete
A summary typically lists the test items it covers, sometimes with a result and sometimes with a status. Read the status column carefully. A result recorded as complete is usable; an item marked pending, in progress or covered by an earlier report needs a follow-up document. A summary that lists the items without results is a table of contents, not evidence.
The judgement here is about completeness rather than interpretation. You do not need to assess the test method to notice that an item has no result, or that the report reference for one item points to a different configuration. Both are visible from the page, and both are reasons to ask for the missing part before booking freight.
Check four: version and validity
The last check is the one that catches the most shipments. The summary in the supplier's folder is often the version issued before the last design change: a new cell, a revised protection board, a different pack enclosure, a moved thermistor. None of those changes necessarily invalidates the test, but each means the document should be reviewed and, if the configuration changed materially, re-issued.
Ask for the issue date and the revision, then compare them with the dates of your approved changes. If the summary predates a change that touched the cell, the protection circuit or the pack construction, ask the supplier to confirm in writing whether the document still covers the shipped configuration. A written confirmation from the responsible engineer is a usable record; a verbal assurance is not.
A test summary ≠ a test report
The boundary: a summary is a statement that testing was performed on a configuration, and it is not the report itself, not a safety data sheet, and not a transport approval for your shipment. Each of those is a different document with a different purpose, and the carrier may ask for more than one.
The second boundary is scope. A summary describes a pack, not a product. It says nothing about the heating element, the control board, the OTP behaviour or the shell, and it does not make a shipment compliant on its own. It is one line in the file, and it should be filed as one line rather than as the answer to a transport question.
Five questions for the supplier
- Which pack part number does this summary describe, and is that the part number in our approved bill of materials? Ask for the two numbers to appear together in one reply.
- Does the summary include finished-pack testing as well as cell testing, and can you send the corresponding report references? Cell-only evidence describes half the configuration.
- Are any test items marked pending or covered by an earlier report for a different configuration? A status column with an exception is a finding.
- What is the issue date and revision, and does it postdate the last change to the cell, the protection circuit or the enclosure? Compare dates, do not ask for reassurance.
- What is your notification process if the cell or the pack construction changes before our next order? Get the answer as a clause in the supply agreement.
Next step
Run the four checks on the summary you already hold, then file the result next to the packing list so the forwarder sees the same version you approved. Log the reference and the date in the certification document matrix by market, and attach the summary revision to the golden sample signoff form so a later pack change reopens the right document. If any check fails, request the corrected document before the booking is made rather than after the container is loaded. The MSDS sixteen sections review covers the carton, and sea freight vs air freight for battery goods.
Written for the Emberly heating-element programme. Specifications are illustrative; confirm every figure against a supplier test record.