Shipping EV Batteries From China: Dangerous-Goods Rules, UN 3171 & State of Charge (2026)
In short: How China EVs ship as dangerous goods under UN 3171, Class 9 — IMDG Code, UN 38.3, state of charge, spare-battery UN 3480 rules and the documents importers must confirm.
Shipping an electric vehicle out of China means shipping a large lithium-ion battery, and that changes how the unit is classified, declared and stowed. In almost every case the vehicle travels with its traction battery installed and is regulated as dangerous goods under UN 3171 ("battery-powered vehicle"), Class 9 of the IMDG Code for sea transport. This is routine: hundreds of thousands of China-built EVs move by RoRo and container every year on exactly this basis. The regulatory weight sits with the exporter and the shipping line, not the buyer. Your job as an importer is to confirm the mode, the state of charge (SoC) policy and the paperwork before you book. This guide sets out the framework — UN 38.3, ADR/RID inland legs, the CTU Code, spare-battery rules under UN 3480/UN 3481 — so you know what a competent forwarder is handling on your behalf and what to check before cargo loads.
The direct answer: an installed EV battery ships as UN 3171, Class 9
When a battery-electric or plug-in hybrid vehicle is shipped with its battery fitted and connected, it is assigned to UN 3171, described as "battery-powered vehicle" or "battery-powered equipment", and classified as Class 9 — Miscellaneous dangerous goods. Class 9 covers lithium batteries and articles that contain them because a damaged or defective cell can generate heat, fire or toxic gas. Assignment to UN 3171 does not make an EV difficult or exotic to move; it means the shipment must be declared correctly, stowed according to the carrier's rules, and accompanied by the right documents. Both RoRo (drive-on car carriers, known as PCTCs) and container shipping accept UN 3171 vehicles as standard cargo. The classification is stable and internationally recognised, which is precisely why the process is predictable when handled by an experienced exporter.
The regulatory framework you are shipping under
Several instruments interlock across the sea leg and any inland road or rail legs. Understanding which applies to which mode prevents surprises at the destination border, especially for overland routes into the EAEU (Kazakhstan, Russia and neighbours).
- IMDG Code (sea). The International Maritime Dangerous Goods Code governs ocean transport. It places lithium-battery articles in Class 9 and sets declaration, stowage and segregation requirements for UN 3171, UN 3480 and UN 3481.
- ADR (road) and RID (rail). ADR governs dangerous goods by road and RID by rail. These apply to inland legs — for example a vehicle railed or trucked from a Chinese inland hub, or moved onward from a Caspian or Black Sea port into Central Asia and the EAEU.
- UN 38.3. The UN Manual of Tests and Criteria, sub-section 38.3, is the transport-safety test every lithium cell and battery type must pass — covering altitude, thermal cycling, vibration, shock, short circuit and overcharge. Reputable Chinese EV and cell makers hold UN 38.3 test summaries for their batteries.
- CTU Code. The IMO/ILO/UNECE Code of Practice for Packing of Cargo Transport Units governs how goods are secured inside a container — relevant when EVs or spare batteries move in boxes rather than by RoRo.
- SDS / MSDS. A Safety Data Sheet documents the battery chemistry and emergency response information, part of the paperwork set that supports the dangerous-goods declaration.
For an installed-battery vehicle the exporter's forwarder maps these onto your chosen route. A pure RoRo booking to a nearby port engages mainly the IMDG Code; a multimodal route to a landlocked market layers ADR or RID onto the sea leg.
UN 3171 vs UN 3480 and UN 3481: which number applies
The single most common point of confusion is which UN number governs a given item. The installed vehicle battery, a crate of spare battery modules, and a battery shipped inside a replacement part are three different regulatory situations. The table below is the quick reference professional exporters work from.
| UN number | Description | When it applies | Modes |
|---|---|---|---|
| UN 3171 | Battery-powered vehicle / equipment | EV or PHEV shipped with its traction battery installed and connected — the normal case | Sea (IMDG), road (ADR), rail (RID) |
| UN 3480 | Lithium-ion batteries (standalone) | Loose or spare battery packs/modules shipped on their own, not inside equipment | Sea (IMDG), road (ADR), rail (RID) |
| UN 3481 | Lithium-ion batteries packed with, or contained in, equipment | A battery inside a spare part, module or sub-assembly shipped as a component | Sea (IMDG), road (ADR), rail (RID) |
| UN 3536 | Lithium batteries installed in a cargo transport unit | Batteries built into a container/CTU itself (e.g. a battery-powered reefer unit) | Sea (IMDG) |
For a standard EV purchase, UN 3171 is what appears on the dangerous-goods declaration. The moment you add loose spare batteries to the order, UN 3480 enters the picture with stricter packing and quantity rules. This is why bundling a stock of spare packs into the same shipment should always be discussed with the forwarder in advance.
State of charge: typically moderate, and set by the carrier
Shipping lines commonly require that an EV's battery be at a moderate state of charge before loading, not full and not empty. Indicative figures quoted in the market cluster around 30%, with some lines and routes permitting up to about 50%. Treat any specific percentage as typical/indicative only: the exact figure is set by the shipping line for the specific vessel and route, and it can change. A moderate SoC reduces stored energy during transit while keeping the battery healthy over a long voyage. Crucially, this is configured by the exporter before the vehicle is loaded — the buyer does not manage it and does not need to. A professional exporter charges or discharges each unit to the booked line's target window and records the reading on the SoC confirmation that travels with the shipment.
Car-carrier fire safety: why declaration discipline matters
Several high-profile fires aboard pure car and truck carriers (PCTCs) have pushed the IMO, class societies and vessel operators to tighten how lithium-battery cargo is handled, detected and fought. While investigations into individual casualties have not always isolated a single cause, the industry response has been concrete: enhanced fire-detection expectations, closer attention to stowage of battery-powered vehicles, and firmer rules on accurate dangerous-goods declaration. For importers, the practical implications are simple but non-negotiable. First, the vehicle must be declared honestly as UN 3171 — undeclared or mis-declared battery cargo is the single behaviour operators most want to eliminate. Second, SoC and condition rules exist to lower risk and are enforced at the terminal. Third, damaged, recalled or swollen batteries are not shipped. A serious exporter treats these as hard gates, which is one reason working with an experienced China EV shipper matters more than shaving a few dollars off freight.
The documentation that travels with the shipment
Dangerous-goods paperwork sits alongside the normal commercial and customs documents. Missing or inconsistent documents are the usual cause of terminal delays, so the set below should be assembled before the cargo reaches the port.
| Requirement | What it means in practice |
|---|---|
| Dangerous-goods declaration | Declares the vehicle as UN 3171, Class 9, with proper shipping name and handling information; signed by the shipper and lodged with the line. |
| SoC confirmation | Written confirmation that each battery was set to the carrier's required state of charge before loading, with the recorded percentage. |
| UN 38.3 test summary | Evidence the battery type passed the UN 38.3 transport tests; held by the manufacturer and provided on request. |
| Safety Data Sheet (SDS) | Battery chemistry and emergency-response information supporting the DG declaration. |
| Commercial invoice & packing list | Standard trade documents describing the vehicle, value and terms for customs. |
| VIN and vehicle documents | Chassis/VIN records, and where applicable the export certificate and technical data used for registration abroad. |
| Certificate of origin | Confirms China origin, often needed for duty treatment or preferential tariffs in the destination market. |
On overland routes into the EAEU, ADR or RID transport documents are added for the inland leg. Your forwarder produces these; you should confirm they exist before the vehicle leaves the port of entry.
Spare parts and loose batteries: stricter than an installed pack
An installed battery inside a vehicle is comparatively straightforward under UN 3171. A loose or spare battery pack shipped on its own is not — it moves under UN 3480 and attracts stricter packing, marking, labelling and quantity conditions under the IMDG Code. A battery contained in or packed with a replacement part falls under UN 3481. If your order includes spare high-voltage packs, modules or battery-bearing sub-assemblies, tell the exporter early so they can be packaged and declared correctly, and so any quantity limits and stowage requirements are planned into the booking. In practice many importers stock spare packs separately or source them locally precisely to avoid layering UN 3480 complexity onto a clean UN 3171 vehicle shipment.
- Correct packing. Loose lithium-ion packs need approved packaging, terminal protection and Class 9 lithium-battery marking and labelling.
- Quantity and stowage. Larger consignments face stricter stowage and possible quantity thresholds; these are line- and route-specific.
- Separate declaration. UN 3480/3481 items are declared distinctly from the UN 3171 vehicles in the same shipment.
What importers must confirm before booking
You do not need to manage battery chemistry or DG paperwork yourself, but you should verify that your exporter and forwarder have the essentials locked before you commit to a sailing. The following is the pre-booking checklist that keeps an EV shipment moving.
- Mode and route. RoRo or container, direct or multimodal, and whether an ADR/RID inland leg is required for your market — this drives cost and transit time.
- SoC target. The carrier's required state of charge for your specific vessel and route, confirmed in writing.
- DG declaration ownership. Who lodges the UN 3171 declaration and holds the SDS and UN 38.3 summary — normally the exporter's forwarder.
- Spare-battery handling. If spares are included, confirmation they will ship under UN 3480/3481 with correct packing.
- Destination checks. Whether the destination market runs battery health or safety inspections at import, and what evidence they expect.
- Total landed cost. DG handling, port fees, duties and inland transport folded into a single figure so freight quotes are comparable.
Some markets run destination-side battery checks — state-of-health readings, safety inspections or homologation evidence — before a vehicle can be registered. Confirm the requirement for your country early, because it can affect which documents the exporter must supply from China.
Frequently asked questions
Can an electric vehicle be shipped with its battery installed?
What is UN 3171?
Does shipping as Class 9 dangerous goods delay or block my EV?
What state of charge is required to ship an EV from China?
Who sets and manages the state of charge — the buyer or the exporter?
What is the difference between UN 3171, UN 3480 and UN 3481?
What is UN 38.3 and does my EV battery need it?
What documents travel with an EV shipment as dangerous goods?
Are the rules different for RoRo versus container shipping?
Can I include spare battery packs in the same shipment?
Why have car-carrier fire rules tightened, and how does it affect me?
Do some markets inspect the battery on arrival?
Is it my responsibility as the buyer to prepare the dangerous-goods paperwork?
China-origin EVs move under UN 3171 every day, and a competent exporter absorbs the dangerous-goods work so your shipment stays predictable. Confirm the mode, SoC target and documentation before you book, and fold DG handling into a single landed figure using our landed cost calculator. See how vehicles leave China in our RoRo and container shipping guide and the China EV export ports guide, review destination requirements for Kazakhstan and other markets, then contact our export team to plan a compliant shipment.