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What Is a UN 38.3 Test Summary and What Should It Include?
When sourcing lithium batteries for an OEM product or industrial application, reviewing the supplier's UN 38.3 documentation is an important part of the purchasing process. However, receiving a Test Summary does not automatically mean that the document covers the exact battery you intend to purchase.
The key is to verify whether the tested cell or battery matches the product's actual design, model, and configuration. This is especially important for custom battery projects, where design changes may affect the applicability of existing test documentation.
This guide explains what a UN 38.3 Test Summary should include and how OEM buyers can check whether the document is relevant to their battery procurement requirements.
What Is a UN 38.3 Test Summary?
A UN 38.3 Test Summary is a standardized document that provides key information about a lithium cell or battery and the results of the tests conducted under Section 38.3 of the UN Manual of Tests and Criteria.
These tests evaluate whether a lithium cell or battery meets the applicable requirements for transportation. Manufacturers and subsequent distributors are required to make the relevant Test Summary available.
A Test Summary is different from a full UN 38.3 Test Report:
| Document | Main Purpose | Typical Content |
|---|---|---|
| UN 38.3 Test Summary | Provides a standardized overview of the tested cell or battery | Manufacturer details, battery description, testing laboratory, report identification, and test results |
| Full UN 38.3 Test Report | Provides detailed records supporting the testing and evaluation | Test conditions, procedures, measurements, observations, and detailed results |
The Test Summary helps buyers identify the tested product and review the reported test results. The full Test Report provides more detailed technical evidence and may be requested when the product's test coverage or configuration needs further clarification.
Important: UN 38.3 is a transportation testing requirement. A UN 38.3 Test Summary does not, by itself, demonstrate compliance with every product safety, performance, or application-specific standard. Buyers should assess other applicable requirements separately, such as IEC 62619 or UL 1973 where relevant to the project.
For a broader explanation of when custom lithium battery packs require UN 38.3 testing, see our guide to UN 38.3 testing requirements for custom lithium battery packs.
What Information Must a UN 38.3 Test Summary Include?
Under subsection 38.3.5 of the UN Manual of Tests and Criteria, a Test Summary should contain specific information that allows the tested cell or battery and its test records to be identified.
OEM buyers should review the following items.
1. Manufacturer Information
The document should identify the cell, battery, or product manufacturer, as applicable.
Check that the manufacturer's name and contact details are provided, including:
Company name
Address
Phone number
Email address
Website
The information should allow the buyer to identify the responsible manufacturer and contact the relevant party if clarification is needed.
2. Testing Laboratory Information
The Test Summary should identify the testing laboratory and provide its contact details, including its address, phone number, email address, and website.
Buyers should check whether the laboratory information is complete and whether the laboratory can be identified for further verification if necessary.
3. Test Report Identification Number and Date
The summary should reference a unique test report identification number and the date of the test report.
These details are important for document traceability. If a supplier provides additional supporting records, the report number should help establish whether those records relate to the same testing process.
4. Battery Description and Model Number
The battery description is one of the most important sections for OEM buyers because it helps establish what was actually tested.
The summary should identify the cell or battery and include the following information, as applicable:
Battery chemistry, such as lithium-ion or lithium-metal
Mass
Watt-hour rating for lithium-ion batteries or lithium content for lithium-metal batteries
Physical description of the cell or battery
Model number or model numbers
Do not check the model number in isolation. Review it together with the chemistry, physical description, and other product specifications to determine whether the document corresponds to the intended battery design.
5. Tests Conducted and Results
The Test Summary should list the tests conducted and their results, typically indicated as pass or fail.
The UN 38.3 test series includes:
T.1: Altitude Simulation
T.2: Thermal Test
T.3: Vibration
T.4: Shock
T.5: External Short Circuit
T.6: Impact or Crush
T.7: Overcharge
T.8: Forced Discharge
The applicable tests depend on the type of cell or battery and the relevant testing requirements. Buyers should not assume that every test in the series must apply to every battery type.
If the summary contains unclear results or does not identify the applicable tests, ask the supplier to clarify the testing scope.
6. Reference to Assembled Battery Testing Requirements
Where applicable, the Test Summary should refer to the assembled battery testing requirements under paragraphs 38.3.3(f) and 38.3.3(g).
This information is particularly relevant when evaluating battery packs assembled from multiple cells. Buyers should confirm how the applicable requirements have been addressed for the final battery type.
7. Reference to the UN Manual Edition and Amendments
The summary should identify the revised edition of the UN Manual of Tests and Criteria used for testing, including any applicable amendments.
This reference helps buyers understand which version of the testing requirements was applied.
When reviewing older documentation, check the referenced edition and consider whether subsequent design changes or applicable regulatory updates affect the procurement or shipment assessment.
8. Responsible Person's Name and Title
The Test Summary should identify the responsible person's name and title.
Buyers should check that this information is present and that the document is attributable to the responsible organization.
How to Verify a UN 38.3 Test Summary Before Purchasing
Checking whether all required fields are present is only the first step. OEM buyers also need to determine whether the document applies to the battery specified in the purchase order or technical agreement.
A practical approach is to compare the Test Summary with the supplier's product specification sheet.
1. Verify the Manufacturer
Confirm that the manufacturer identified in the Test Summary is consistent with the supplier's explanation of the product's manufacturing and testing arrangements.
If the battery is manufactured by a third party or supplied under a different brand, ask the supplier to clarify the relationship between the named manufacturer, the product, and the test documentation.
2. Match the Battery Model and Description
Compare the model number and physical description in the Test Summary with the battery offered for purchase.
Check whether the document identifies the same cell or battery type. If the model number differs, ask the supplier to explain whether the difference reflects a naming convention, product revision, or a change to the tested design.
A model number discrepancy does not automatically invalidate a Test Summary, but the supplier should provide a clear explanation of its applicability.
3. Compare Key Battery Specifications
Use the following checklist to compare the Test Summary with the actual product specification sheet.
| Information to Check | What Buyers Should Verify |
|---|---|
| Manufacturer | Does the named manufacturer correspond to the product's manufacturing arrangement? |
| Model number | Does the tested model match the supplied model, or is the relationship documented? |
| Chemistry | Is the battery chemistry consistent? |
| Mass | Is the reported mass consistent with the relevant cell or battery design? |
| Watt-hour rating | Does the energy rating correspond to the intended battery? |
| Physical description | Does the document describe the same cell or battery type and construction? |
| Configuration | Is the tested configuration relevant to the final battery being purchased? |
Small differences in product descriptions or specifications should be reviewed in context. They do not automatically mean that the test documentation is invalid. The important question is whether the supplied battery remains within the scope of the tested design type and applicable requirements.
4. Confirm the Test Results and Scope
Review the tests conducted and their reported results. Confirm that the applicable tests are identified and that the documentation clearly indicates the scope of the tested battery.
If the summary does not provide enough information to establish coverage, request supporting documentation from the supplier rather than making assumptions about the test scope.
5. Check Document Traceability
Check the report identification number, test date, testing laboratory, and responsible person's details.
These fields help establish a traceable connection between the Test Summary and the underlying test records. For a custom battery project, also ask how the supplier controls design revisions and confirms that the production battery remains consistent with the tested configuration.
Example: Reviewing a UN 38.3 Test Summary for a Custom 48V LiFePO4 Battery Pack
Consider an OEM buyer sourcing a custom 48V LiFePO4 battery pack for an industrial application.
The supplier provides a UN 38.3 Test Summary, but the document identifies an individual LiFePO4 cell rather than the complete battery pack.
Should the buyer accept this document as proof that the 48V battery pack has met the applicable UN 38.3 requirements?
Not without further clarification.
The buyer should:
Identify the tested item. Determine whether the Test Summary covers an individual cell, a battery, or a product containing a battery.
Compare the final pack configuration. Check whether the supplied 48V pack uses a configuration relevant to the tested battery design.
Review assembled-battery requirements. Ask the supplier to explain how the applicable requirements under Section 38.3, including the relevant assembled-battery provisions, have been addressed.
If the available documentation only covers the individual cells, the buyer should not assume that it establishes compliance of the complete battery pack.
This distinction matters for OEM procurement because the buyer needs documentation relevant to the battery that will actually be manufactured, supplied, and shipped.
What Should OEM Buyers Do If UN 38.3 Documentation Is Incomplete?
If a supplier provides an incomplete Test Summary or documentation that does not clearly match the intended battery, buyers should resolve the gaps before treating the documentation as sufficient for the project.
A practical follow-up process includes:
1. Ask the supplier to clarify missing information.
Identify the specific missing fields, unclear test results, or inconsistencies between the Test Summary and the product specification sheet.
2. Confirm the tested battery type.
Ask whether the document applies to an individual cell, a battery, an assembled battery, or a product containing a battery.
3. Request the applicable Test Summary and supporting records.
If the supplied document does not clearly cover the final battery, request the relevant Test Summary for that battery type. Where necessary, ask for supporting test documentation or the full Test Report to clarify the test scope and design coverage.
The full Test Report may be subject to confidentiality arrangements, but the supplier should still be able to explain the basis for the documentation's applicability.
4. Arrange further technical review if needed.
If the battery configuration differs from the tested design, ask the manufacturer to assess whether the changes affect the applicability of existing test results or whether additional testing is necessary.
5. Confirm documentation readiness before shipment.
Resolve outstanding questions about the tested battery type, document traceability, and applicable transport requirements before the battery is prepared for shipment.
How Can a Custom Battery Manufacturer Support UN 38.3 Documentation?
For OEM and industrial battery projects, UN 38.3 documentation should be considered during product development rather than only when an order is ready to ship.
A custom battery manufacturer can support the process through several stages:
Design review: Evaluate the battery architecture, cell selection, electrical configuration, and enclosure before testing.
Testing coordination: Coordinate the applicable UN 38.3 testing for the relevant cell or battery type.
Documentation preparation: Prepare and maintain the relevant Test Summary and supporting documentation.
Configuration verification: Review design revisions and confirm whether the production configuration remains within the scope of the applicable test documentation.
For custom projects, clear communication between the OEM buyer and battery manufacturer helps reduce documentation gaps and avoid delays during procurement and shipment preparation.
Conclusion
A UN 38.3 Test Summary provides essential information about a lithium cell or battery and its transportation test results. For OEM buyers, however, reviewing the listed fields is not enough. The document must also be relevant to the actual battery model, configuration, and design being purchased.
Before placing an order, compare the Test Summary with the product specification sheet, confirm whether the documentation covers the final battery type, and request supporting records whenever the test scope is unclear.
If you are developing a custom lithium battery for an OEM or industrial application, ACE Battery can support battery design, testing coordination, and documentation preparation throughout the project. Explore our custom battery ODM services to discuss your project requirements.
References
For further information on UN 38.3 testing and lithium battery transportation requirements, refer to the following resources:
UN Manual of Tests and Criteria, Revision 8 and Amendment 1 (2025) – Official testing procedures and requirements for lithium cells and batteries, including subsection 38.3.
UN Model Regulations, 24th Revised Edition (2025) – International recommendations concerning the transport of dangerous goods, including lithium battery transportation provisions.
Lithium Battery Test Summary – Google – An example of a published lithium battery Test Summary illustrating how the required information may be presented.
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