UN38.3 Shipping Lithium: What Your Forwarder Will Ask For
Every time a device with a lithium cell crosses a border, someone in the chain has to prove the battery is safe to transport. That proof is the UN38.3 test report, and it is the first thing a forwarder will ask for when you book lithium battery air freight. The mistake most buyers make is treating it as a document the supplier can simply email over on request. It is a test scope tied to a specific cell and pack configuration, and it ages the moment that configuration changes.
What the forwarder actually asks for
When you request a quote for air freight, the forwarder or carrier will normally ask for the UN38.3 test report and the accompanying test summary, a safety data sheet (SDS) for the battery, the cell chemistry and watt-hour rating, and confirmation of how the cells are packed and labelled. For air shipments they will also want a shipper's declaration and evidence that the cells were manufactured under a recognised quality management system. None of this is optional paperwork; a missing item stops the booking rather than slowing it down.
The SDS is the document buyers most often underestimate. It is not the same as the test report, it must be current, and it must match the cell chemistry you are actually shipping. If your supplier sends an SDS for a different cell than the one in the sample you approved, expect the forwarder to reject the shipment at the point of acceptance. Our buyer resources set out the document set we supply per model and hardware revision so you can compare it against what your forwarder requests.
The test scope is tied to the build, not the brand
UN38.3 applies to the cell and to the battery pack as configured. A supplier who has tested one pack layout cannot simply extend that report to a different enclosure, a different cell, or a different number of cells in series. This is the single most common source of delay in a new programme: the buyer assumes the report exists because the supplier has shipped similar products before, and discovers at booking that the tested configuration is not the one being produced.
Ask for the report before tooling is released, not after. If the supplier cannot name the cell and pack configuration the report covers, treat that as an open item. The same discipline applies to the wider compliance file; the CE RED document checklist is a useful model for how to map documents to a specific hardware revision rather than to a product family.
How long it takes, and why
Where the cell and pack are already tested, assembling the file is a matter of confirming the configuration matches and issuing the SDS and summary. Where the pack is new, the testing itself runs on the laboratory's schedule and sits on the critical path alongside tooling. Buyers who plan for the documents at the same time as the samples avoid the situation where finished goods sit in the factory because the transport file is not ready.
| Item | What the forwarder checks | When to request it |
|---|---|---|
| UN38.3 test report | Cell and pack configuration matches the goods | Before tooling release |
| Test summary | Present and consistent with the report | With the report |
| Safety data sheet | Current, correct chemistry, supplier named | Before booking |
| Watt-hour rating and chemistry | Stated on the pack and in the file | At sample approval |
| Packing and label evidence | Matches the declared packing instruction | Before first shipment |
| Quality management evidence | Cells produced under a recognised system | With the report |
Where an importer should say no
A supplier who offers to "sort the battery documents later" is asking you to carry the transport risk. Say no when the report cannot be matched to the exact cell and pack, when the SDS is generic or undated, or when the supplier proposes shipping under a different product's paperwork. Say no equally when a supplier claims a certificate is held without being able to show the scope and the issuing laboratory. Certification here is a test scope booked with an accredited laboratory per build, and it should be described that way.
- Confirm the cell and pack configuration in writing before tooling.
- Ask which laboratory holds the report and what it covers.
- Check the SDS chemistry against the approved sample.
- Decide air or sea early; the document set and packing differ.
- Keep the file versioned to the hardware revision, not the product name.
The same logic governs the rest of the compliance file. Toy scope is decided by the age grading printed on the packaging and booked per build. Service robots carry an EMC and low-voltage scope, a class 1 laser statement for the LiDAR and a documented risk assessment. EU and UK importer duties such as WEEE, BattG and Triman sit with you, the importer, not the factory. If you are weighing how much of the design to own, OEM versus ODM explains where the documentation responsibility moves.
Building the file into the schedule
Battery documents are a schedule item, not an afterthought. Our published lead times are 25-35 days for production, 30-40 for education models, and 12-20 weeks for ODM tooling, with samples at 3-5 days for stock and 7-15 for configured units. Plan the transport file against those dates and it stops being a surprise. If you want to see how the compliance set is assembled per model, the factory page covers our QC gates and document handover, and MOQ, sampling and lead times sets out the thresholds, from 500 units standard to 300 for AI glasses and 50 for service robots quoted per project.
Before you place a purchase order, send your forwarder's document request list to your supplier and ask them to confirm, item by item, which configuration each document covers. If any answer is vague, that is the item to resolve first. You can send us the specification and we will tell you which documents apply to your build and which do not.
Questions buyers ask
What documents does a forwarder request for a device with a lithium cell?
Typically the UN38.3 test report and test summary, a current safety data sheet, the watt-hour rating and cell chemistry, plus packaging and label evidence. For air freight the carrier also wants the shipper's declaration and proof the cells were produced under a quality management system.
How long does it take to get UN38.3 documents for a new build?
It depends on whether the cell and pack are already tested. If the supplier reuses a tested cell and pack configuration, you are usually assembling existing paperwork; a new pack layout or a different cell triggers fresh testing and adds weeks to the schedule.
Related: more on sourcing & compliance · buyer guides · customisation tiers