UN 38.3 documentation for rack battery exports

Who needs what, and when

Every document in the set has one owner and one deadline. Move them out of order and the crate sits in a warehouse while the project schedule burns.

• Engineering — at design freeze. The UN 38.3 Test Summary describes a battery design, not a serial number. Until it exists, nobody downstream can book freight. On an OEM or ODM program this is the first gate, because the summary has to describe the cell, the 16S string and the enclosure you just froze.
• Freight forwarder — before booking. Class 9 space is booked against the Test Summary and the declared watt-hour rating. Air capacity in particular is allocated per shipment and per aircraft type, so a booking taken without documents is a placeholder, not a reservation.
• Carrier — at pickup. The accepting agent compares the marked and labelled package with the shipper's declaration for dangerous goods. No declaration, no acceptance. No Class 9 lithium battery label, no acceptance.
• Customs — at export and at import. Commercial invoice, packing list and dangerous goods paperwork move as one file. A quantity on the invoice that disagrees with the packing list is a hold, not a question.
• Receiving site EHS — before the pallet is opened. The safety data sheet tells the site what is inside, how to handle a damaged crate, and where the unit may be stored. Many data centres will not accept a Class 9 delivery at the dock without it on file.

Samples ship first, normally 2 to 4 weeks after specification freeze, and they usually fly. That is deliberate. One unit on one air waybill exercises the whole path — Test Summary, MSDS, shipper's declaration, Class 9 marking, state-of-charge limit — at low volume, where a missing page costs a week instead of a container. Volume then moves by sea under the IMDG Code, 4 to 8 weeks per batch, with the shipment-level documents reissued for each consignment.

The UN 38.3 Test Summary: the eight tests and what the document shows

UN 38.3 sits in the UNECE Manual of Tests and Criteria, Section 38.3. Eight tests make up the sequence, and each one screens a different way a lithium battery fails in transport.

Since 2020 a Test Summary must be made available on request. It is issued by the manufacturer — the cell maker or the pack builder — not by a regulator and not by a laboratory authority. It covers a battery design rather than a production serial number, which is why one summary can support thousands of units and why a design change can end its validity.

A usable Test Summary states:

• The cell and battery manufacturer, a contact, and the test laboratory's name, address and test date.
• A description of the cell or battery: the electrochemical system, a physical description, the ratings (capacity, voltage and watt-hour rating), the mass, and the lithium content or watt-hour rating that classifies the shipment.
• The list of tests performed, the result of each, and the failure and remedy narrative where a test failed during development.
• The assembly description: the series and parallel configuration and the number of cells.

Read the first and last of those items before anything else. If the cell described is not the cell in your bill of materials, or the assembly described is not 16S, the summary is not your document, whatever its test results say. Our 21700 LFP platform is graded and matched into 16S strings per production lot, and the Test Summary travels with that description.

Watt-hour rating: the number that sets the rules

The watt-hour rating decides which transport provisions apply, and it is arithmetic, not opinion. Rated voltage multiplied by rated capacity:

• VB-5125 rack shelf: 51.2 V x 100 Ah = 5,120 Wh = 5.12 kWh per shelf. The 300 Ah high-capacity variant: 51.2 V x 300 Ah = 15,360 Wh, about 15.4 kWh.
• VB-E3 in-server module: 1.5 kWh per module on a 48 V / 54 V bus, 2.9 kg each.
• VB-H400 HV shelf: 11.6 kWh at ±400 VDC, 18.6 kg excluding busbars.

Those numbers also scale into freight terms. Fifteen VB-5125 shelves in one group carry 15 x 5.12 kWh = 76.8 kWh, which at 1C is roughly 77 kW of backup power for an 80 kW-class bay. That matters twice: once in the electrical design, and once on the declaration, where net quantity is stated per package. Fifteen shelves is a different declaration from one shelf.

The transport rules draw their line at 100 Wh per battery and 20 Wh per cell. Below that line a battery can move under the lighter provisions; above it, it cannot. Every unit above is between 15 and 100 times over the threshold, so none of them qualify for small-battery treatment. This is the single most common source of wrong paperwork we see from buyers building their own shipping files: the shelf is not a laptop pack, and the invoice cannot describe it as one.

Air adds a second constraint. Lithium cells and batteries shipped on their own by air are offered at a state of charge of no more than 30% of rated capacity. A charged battery carries more energy into a hold with limited fire suppression, so the rule is written into the air regulations and enforced at acceptance. For us that is a factory instruction, not a forwarder preference: the shelf leaves the line at or below the limit and the packing record shows it.

The packing instruction then depends on how the unit travels:

• PI965 — battery shipped alone. Fully regulated Class 9 cargo, and the larger units move as cargo-aircraft-only freight.
• PI966 — battery packed with equipment, in the same outer packaging but not installed in it.
• PI967 — battery contained in equipment, installed in the rack or server it powers.

Most rack BBU volume moves by sea under the IMDG Code, where the package limits and the state-of-charge treatment differ from air. The document set does not change; the packing instruction cited on it does. Ship the same shelf as PI965 in January and PI967 in June and the declaration must be rewritten, not amended by hand.

The rest of the document pack

The Test Summary is the first paper, not the only one. A complete export file for a rack battery looks like this.

Two rows decide most of the timing. The declaration has to be signed by the shipper named on the transport document, so it cannot be prepared by the buyer's customs broker in advance. And the packing list has to be final before the declaration is signed, which means the carton count is fixed before the truck arrives, not during loading. Build both into the shipping plan and the rest of the file is routine. The trade desk FAQ lists the same pack in table form with Incoterms and lead times beside it.

What carriers and forwarders actually check

Acceptance is a comparison exercise, and the checklist is short and literal:

• Is the UN number and proper shipping name correct on the declaration? UN3480 for a battery shipped alone, UN3481 for a battery packed with or contained in equipment. The wrong one of the two is the most frequent rejection at the counter.
• Does the declared watt-hour rating match the Test Summary and the datasheet? 5.12 kWh on the declaration and 4.8 kWh in the product sheet will be caught, and the shipment will wait while the discrepancy is explained.
• Are the packages marked and labelled — Class 9 lithium battery label, UN number, shipper and consignee, and the orientation marks where the packaging requires them?
• Is the state of charge within the air limit for the mode, and does the packing record show it?
• Is the emergency contact reachable? A monitored 24-hour number, not a general inbox that closes at 18:00 local time.
• Does the declaration match the packing list line by line — package count, net quantity per package, model numbers?

A forwarder who finds an inconsistency will normally refuse the shipment rather than correct it. That is not obstruction. The shipper is legally responsible for the accuracy of the declaration, and an agent who edits it is signing for something they cannot verify. The practical consequence for a buyer is that a paperwork error costs a full booking cycle, not an afternoon, because the space is released and has to be requested again.

Expiry and revision: what invalidates a document

The Test Summary binds to the battery design. Changing the cell, the cell count, the series or parallel arrangement, the BMS protection limits or the enclosure can invalidate it and restart testing. A new production lot of the same graded 21700 cell does not; a different cell model does. That distinction is worth writing into any supply agreement, because it tells you which engineering change orders need a lead time for testing and which do not.

The MSDS is versioned and follows the current product revision. It is a living document rather than a fixed test result, and the revision in force on the shipping date is the one that must travel.

The shipper's declaration is per shipment in the strictest sense. It cannot be copied to a later consignment with a different quantity or a different route, and it cannot be reused after a packing instruction change. Treat it as a form that is filled from the current order, never from the last one.

The drop test report is tied to the packaging design in the same way the Test Summary is tied to the battery design. Replacing foam with a moulded insert is a packaging change, and the report you hold describes the old one.

Regulation (EU) 2023/1542 adds its own document requirements over time, including battery passport rules from 2027 for batteries over 2 kWh. Every unit on this page is above that line, so for EU destinations the passport is a mainstream requirement rather than an edge case, and the data behind it has to be retrievable per serial number.

The five failure modes that delay shipments

• Test Summary covering a different cell than the one in the crate. Fix: match the summary's cell description to the bill of materials line before booking, and re-issue when the cell model changes rather than when the forwarder asks.
• A declared watt-hour rating that does not match the datasheet. Fix: compute it once from rated voltage x rated capacity — 51.2 V x 100 Ah = 5,120 Wh — and use that exact figure on the declaration, the invoice and the product sheet.
• An air shipment prepared above the allowed state of charge. Fix: put the discharge step at the end of the end-of-line procedure and record the resulting state of charge in the packing record. This cannot be corrected at the airport.
• An MSDS that is two revisions old. Fix: tie the MSDS revision to the product revision in the ERP so a bill-of-materials change triggers a re-issue, and check the revision date at packing, not at the dock.
• Documents arriving after the booking instead of before it. Fix: treat the document pack as a shipment milestone. Class 9 space is booked against the pack, so the pack is on the critical path, not in parallel with it.

How we prepare the pack

Every VoltBridge order ships with a certificate of conformance, an MSDS, Class 9 transport documentation and the drop test report. The UN 38.3 Test Summary is available on request: our cells are UN 38.3 tested and the Test Summary travels with the shipment file, and every cell lot is screened on an in-house pre-compliance bench across the T.1 to T.8 items before it reaches an accredited third-party laboratory. Packs are designed and tested to IEC 62619:2022, marked CE with a Declaration of Conformity available, RoHS and REACH compliant, with UL 9540A test data available per product. Per-batch QC records are retrievable by serial number, which is also what an EU battery passport file will ask for from 2027.

Samples ship first, 2 to 4 weeks after specification freeze, so the paperwork path is tested at single-unit volume before any container is booked. Volume production runs 4 to 8 weeks per batch. FOB Shenzhen and FOB Ningbo are our standard terms, with CIF and DDP negotiable for EU and US destinations. MOQ is 10 to 50 units for BBU modules depending on the model, and engineering samples are supported for qualified projects.

Send us the destination market and the shipping mode with your inquiry. We will return the document pack that applies, the packing instruction it will cite, and the lead time attached to it. The contact page reaches the same engineering desk that builds the file.

Sources

• UNECE Manual of Tests and Criteria, Section 38.3 — the eight-test sequence T.1 to T.8 for lithium cells and batteries, and the Test Summary requirement in force since 2020
• IATA Dangerous Goods Regulations — packing instructions PI965, PI966 and PI967 for lithium ion cells and batteries
• IMDG Code — Class 9 lithium battery transport by sea, including the packing and documentation rules for containerized shipments
• EUR-Lex Regulation (EU) 2023/1542 — battery passport rules applying to batteries over 2 kWh from 2027
• IEC 62619:2022 — safety requirements for industrial lithium cells and batteries