UN 38.3 Explained: What It Is, Who Needs It, and How to Get the Test Summary

Last updated: September 2026

What is UN 38.3?

UN 38.3 is the transport test standard in sub-section 38.3, Part III, of the UN Manual of Tests and Criteria: lithium-ion, lithium-metal, and — since the 2023 eighth edition — sodium-ion cells and batteries must pass its eight tests before they may be shipped by any mode of transport. It is not a certificate. Passing produces a lab test report, and manufacturers must make a UN 38.3 test summary available under paragraph 38.3.5. Airlines, ocean carriers, and forwarders ask for that summary before they accept battery cargo.

The name trips people up, so untangle it first: "UN" here does not refer to a UN number like UN 3480. It stands for the United Nations Recommendations on the Transport of Dangerous Goods — Manual of Tests and Criteria, and "38.3" is simply the sub-section number (Part III, section 38, sub-section 38.3). The standard is then enforced through each mode's rulebook — air via the IATA Dangerous Goods Regulations (67th edition, effective 1 January 2026) and the ICAO Technical Instructions, sea via the IMDG Code (2024 Edition, Amendment 42-24, mandatory from 1 January 2026), European road and rail via ADR/RID, and US rules via 49 CFR 173.185 (sources: IATA Lithium Battery Guidance Document, retrieved September 2026, credibility High; IMO, IMDG Code editions, retrieved September 2026, credibility High). The tests themselves are not new — they have gated lithium battery transport for decades. What is recent is the scope: the eighth revised edition of the Manual, published November 2023, added dedicated sodium-ion testing provisions (new paragraph 38.3.3.2), which the 2025–2026 editions of the modal rulebooks have now carried through (source: UNECE, Manual of Tests and Criteria Rev.8, retrieved September 2026, credibility High).

This page is the document-side guide: what the standard is, who it applies to, and how to get the test summary your forwarder keeps asking for. For the lane-level view — which modes will take which battery, packing relationships, and quotes — start at our battery shipping from China hub.

The eight tests

Sub-section 38.3.4 of the Manual prescribes a series of design tests, numbered T.1 through T.8, that sample cells and batteries must survive. In plain language:

Two structural points matter to buyers. First, testing happens at cell level and battery (pack) level — a battery assembled from already-tested cells must itself be tested as a battery, per the assembled-battery testing requirements in 38.3.3 (f) and (g) (source: UN Manual of Tests and Criteria Rev.8, Part III, sub-section 38.3; retrieved September 2026, credibility High). Second, batteries shipped with or inside equipment still originate from tested cells and batteries — the packing relationship changes the packing instruction, never the testing requirement.

Is there such a thing as a "UN 38.3 certificate"?

People search for "UN 38.3 certification", but no authority issues one universal certificate. What actually exists is a pair of documents: the test report a laboratory issues after the T.1–T.8 series passes, and the test summary the manufacturer must make available (paragraph 38.3.5). That is what "UN 38.3 certified" means in practice, and it is why a one-line "batteries comply with UN 38.3" claim inside a safety data sheet does not satisfy the rule — the ten data elements of 38.3.5 are the accepted proof (source: TÜV Rheinland information notice on UN 38.3 test summaries, retrieved September 2026, credibility High). When a supplier offers a "UN38.3 certificate", ask which of the two documents they mean and check it against the checklist further down this page.

Who needs UN 38.3?

The legal duty and the practical need sit with different people, and the distinction is worth knowing when you chase a document.

The legal duty sits with manufacturers and subsequent distributors. Since 1 January 2020, manufacturers and distributors of cells or batteries — and of equipment powered by them — must make the test summary available for cells and batteries manufactured after 30 June 2003. This applies under the UN Model Regulations and is carried into the IATA DGR, ICAO Technical Instructions, IMDG Code, and ADR/RID (source: PRBA/RECHARGE test summary Q&A, retrieved September 2026, credibility High). "Make available" has a defined meaning: the document must be accessible so that the consignor or others in the supply chain can confirm compliance — posting it on a website is acceptable; a paper copy with every consignment is not required (IMDG Code 2024 Edition, note to section 2.9.4.7; source: Britannia P&I advisory on IMDG Amendment 42-24, retrieved September 2026, credibility High).

The practical need reaches everyone who touches the shipment:

What it applies to: all lithium-ion and lithium-metal cells and batteries — power banks included — at any size; sodium-ion cells and batteries since the Rev.8 provisions (UN 3551 / UN 3552, with air packing instructions 976–978 in the IATA DGR 2026); equipment containing them; and battery-powered vehicles, which the 2026-era rulebooks restructured under new entries such as UN 3556 (lithium-ion powered), UN 3557 (lithium-metal powered), and UN 3558 (sodium-ion powered) (sources: IATA DGR 67th edition significant changes, retrieved September 2026, credibility High; Britannia P&I, retrieved September 2026, credibility High).

How each mode enforces it:

The UN numbers you will see on documents:

(Source for packing instructions and restrictions: IATA Lithium Battery Guidance Document, 2026 edition, retrieved September 2026, credibility High.)

What the UN 38.3 test summary must contain

Paragraph 38.3.5 of the Manual lists the information a valid test summary must provide, at minimum:

1. Name of the cell, battery, or product manufacturer, as applicable

2. Manufacturer contact information — address, telephone, email, website

3. Name and contact details of the test laboratory

4. A unique test report identification number

5. The date of the test report

6. A description of the cell or battery: lithium-ion or lithium-metal (and now sodium-ion); mass; watt-hour rating or lithium content; physical description; model numbers

7. The list of tests conducted and their results (pass/fail)

8. Where applicable, reference to assembled-battery testing under 38.3.3 (f) and (g)

9. The revised edition of the Manual of Tests and Criteria used, and amendments if any

10. Signature with name and title of the signatory

There is no mandated format — a supplier's own layout is fine as long as all ten elements are present, and a single document may cover multiple battery models if each carries its own report number and date (sources: PRBA Q&A, retrieved September 2026, credibility High; Labelmaster on the test summary rule, retrieved September 2026, credibility High).

How the requirement got here — and why it keeps appearing in quotes:

One scope detail that surprises sellers of small devices: the test summary applies to small batteries too — there is no de-minimis below which testing is skipped. What size changes is the transport relief level (Section II of the air packing instructions, or IMDG special provision 188 at sea), which simplifies packaging and marking, not the testing itself (source: TÜV information notice, retrieved September 2026, credibility High).

How to get the test summary

Work down this list in order. Most requests close at step one or two.

1. Ask the cell or battery manufacturer. They hold the legal duty to make the document available. Ask in writing for "the UN 38.3 test summary per the Manual of Tests and Criteria, paragraph 38.3.5, covering model number [X]". Name the exact model — summaries cover specific models, and the model mismatch is the most common reason a document gets rejected in review.

2. If you buy a finished product, ask the brand or assembler. A device maker that builds custom packs from third-party cells cannot simply forward the cell maker's summary: the pack itself needed assembled-battery testing under 38.3.3 (f)/(g), and the product-level summary should reference it.

3. Check what you receive against the ten elements. The fastest way is a match pass on the fields that carriers actually verify:

4. If no one has it, commission the testing. An accredited dangerous-goods lab can run the T.1–T.8 series on your product. Cost and duration scale with chemistry and pack size, and sample quantities differ by product type — get a written quotation with sample counts and timeline before committing, and treat lab-quoted numbers as the only real ones. (Lab pricing varies widely; no reliable public benchmark — Unverified as a general figure.)

5. File it with the shipment's document set. The summary travels with your SDS and shipping documents in the booking file — see the battery documents to review before asking for an air rate for the rest of the set a forwarder will ask for.

A reasonable supplier produces the summary within days of a written request — it is a disclosure of a file they already hold, not new work. If the request stalls, that is information, not friction.

When your factory cannot produce it

A supplier who cannot produce a UN 38.3 test summary is telling you something about your supply chain: the cells have no traceable test file, the pack was assembled without pack-level testing, or the "manufacturer" is a trading company that never asked its factory for the document. Any of the three means your cargo's transport eligibility rests on a document that may not exist.

There is a subtle version of this problem that bites even careful buyers: batteries that have been repaired, refurbished, or remanufactured — including replacement of parts with non-original spares or parts of a different specification — can deviate from the manufacturer's tested type, and a deviation from the tested type takes the battery outside the scope of the original tests. The Manual's 2024 amendment (Rev.8 Amend.1) spelled this out explicitly in 38.3.2.2 (source: UN Manual of Tests and Criteria Rev.8, Amendment 1, retrieved September 2026, credibility High). Refurbished-stock sellers are the classic case.

What the gap costs you if it is discovered late: air and ocean acceptance both check the document, so the failure point is the handoff — cargo physically at the airport or terminal that cannot be tendered, storage charges accruing on stock that can neither move forward nor cheaply come back, and a replacement supplier search starting with your customers already waiting. The hub's own FAQ puts it plainly: if your battery manufacturer cannot provide the test summary, that is a supply-chain problem worth knowing about before you have a container of unshippable stock.

The productive sequence when the document is missing:

1. Escalate the written request through the factory to the actual cell maker, with a deadline tied to your production schedule.

2. If the trail goes cold, treat the supplier's eligibility for battery business as failed — and source the pack from a supplier who passes step 1.

3. If the product is your own design, commission pack-level testing yourself (step 4 above) and own the file going forward.

4. Either way, get the rest of the document set reviewed now, not after booking. Send the chemistry, watt-hour rating, packing relationship, and whatever documents you do hold for a pre-check — get a lane quote and our team will tell you what is missing before it blocks a handoff.

Passing UN 38.3 is necessary — but not sufficient

A passing test summary makes the battery eligible for transport. It does not by itself settle how the shipment moves:

• Packing relationship decides the packing instruction — the same cell ships under different rules standalone, packed with equipment, or installed in equipment. Our battery shipping hub breaks down all three.

• Standalone lithium-ion and sodium-ion batteries ship at a state of charge not exceeding 30% by air (Special Provision A331, IATA DGR 2026) and move on cargo aircraft only.

• Marks and labels follow the classification — Class 9 label, the lithium battery mark with its UN number, and the Cargo Aircraft Only label where required; sizes and placement are in our lithium battery shipping labels guide.

• Each carrier's acceptance policy sits on top of the regulations — a rules-compliant package can still be outside a specific airline's current policy, which is why document review happens against the intended route.

• Sodium-ion buyers have a parallel file to build — UN 3551/3552 with packing instructions 976–978 under the same 38.3 testing umbrella.

That layering — eligibility, then packaging, then carrier — is exactly the order a dangerous-goods forwarder reviews your file in.

FAQ

What does UN 38.3 stand for?

Sub-section 38.3 of Part III of the UN Manual of Tests and Criteria — not a UN number. It is the transport test standard lithium and sodium-ion cells and batteries must pass before shipment by air, sea, or ground, enforced through the IATA DGR, IMDG Code, ADR/RID, and 49 CFR.

Is UN 38.3 the same as an MSDS?

No. An MSDS/SDS describes the product's composition and hazards; the UN 38.3 test summary evidences that the specific model passed the eight transport tests. Carriers treat them as separate documents, and a UN 38.3 claim inside an SDS does not replace the summary's ten data elements.

Do small batteries and power banks need UN 38.3?

Yes, at any size — there is no small-battery exemption from testing. Size only changes the transport relief level (such as Section II of the air packing instructions or IMDG special provision 188), which simplifies packaging and marking.

Does the UN 38.3 test summary expire?

The UN Manual sets no expiry date for a test summary. What ends its validity is a change: a modified, repaired, or remanufactured battery that deviates from the tested type needs retesting, and reviewers check that the document's model, rating, and edition reference match the goods actually being shipped.

What is the difference between a UN 38.3 test report and a test summary?

The test report is the laboratory's full record of the T.1–T.8 series; the test summary is the manufacturer's 38.3.5 disclosure distilled from it. Shippers and forwarders work with the summary; labs and quality audits may ask for the underlying report.

Can I ship batteries by sea without UN 38.3?

No. Ocean transport is more flexible on packaging and has no state-of-charge cap, but the IMDG Code (2024 Edition, in force since 1 January 2026) keeps the 38.3 conformity requirement — including under the small-battery exceptions in special provision 188.

Who pays for UN 38.3 testing?

The party controlling the product design normally carries it: the cell manufacturer for cells, the brand or assembler for custom packs. Importers commissioning their own-brand batteries should budget for pack-level testing as a product cost, not a shipping cost.

Sources (all retrieved September 2026):

• IATA Lithium Battery Guidance Document, 2026 edition (packing instructions 965–970 and 976–978, SP A331, cargo-aircraft-only rules) — credibility: High

• IATA DGR 67th Edition — Significant Changes (sodium-ion entries, UN 3563/3564, hybrid battery classification) — credibility: High

• IMO — IMDG Code editions (2024 Edition, Amendment 42-24, mandatory 1 January 2026) — credibility: High

• Britannia P&I — IMDG Amendment 42-24 advisory (2.9.4.7 "make available" note, 2.9.5 sodium-ion, UN 3556–3558) — credibility: High

• UNECE — UN Manual of Tests and Criteria Rev.8 (2023), incl. sodium-ion testing provisions — credibility: High

• UN Manual of Tests and Criteria Rev.8, Amendment 1 (38.3.2.2 repair/refurbish deviation clause) — credibility: High (official text, mirror host)

• PHMSA — Lithium Battery Test Summaries (49 CFR timeline: 1 Jan 2022, revised 10 May 2024) — credibility: High

• PRBA / RECHARGE — Test Summary Q&A (scope, vehicles, format flexibility, 2020 deadline) — credibility: High (industry association filing with the UN Sub-Committee)

• Labelmaster — the test summary rule in practice (no paper copy per shipment, website posting) — credibility: Medium-High

• TÜV Rheinland — UN 38.3 test summary information notice (10 elements, small-battery scope) — credibility: High

Regulatory basis for this article: IATA Dangerous Goods Regulations, 67th edition (2026); IMDG Code, 2024 Edition (Amendment 42-24); UN Manual of Tests and Criteria, Rev.8 and Amend.1; 49 CFR 173.185. Regulatory texts are paraphrased for readability — final compliance calls belong with your forwarder's dangerous-goods specialist.