Lithium battery equipment shipments are frequently delayed by missing UN38.3 test summaries, incomplete dangerous goods documentation, incorrect classification, or improper packaging. But there is a distinction that trips up most shippers before any of that: a lithium shipment passes through two separate gates, and they are not the same thing. Understanding how to clear lithium battery equipment through customs means understanding both, because a shipment can pass one and fail the other.
This guide explains both gates step by step, covering dangerous-goods transport, classification, documentation, and customs clearance. If you are new to regulated trade, review our Trade Compliance Guide for foundational requirements.
The Two Gates: Transport Acceptance and Customs Release
Lithium batteries are regulated dangerous goods under international transport rules. This creates two distinct checkpoints that are often confused. The first is transport acceptance: carriers, freight forwarders, and dangerous-goods handlers assess whether the shipment can move safely by air, sea, or road. The second is customs release: the destination customs authority separately reviews the import declaration, classification, valuation, permits, and destination-market requirements.
These gates are controlled by different parties and can fail independently. A shipment can be perfectly documented for customs and still be refused by the carrier on a dangerous-goods point, and a shipment can be accepted for transport and still be held at customs over classification or valuation. The shipper and carrier control the first gate; the importer, broker, and importer of record manage the second. Our guide on customs and compliance tips for IT hardware imports covers how documentation gaps trigger inspections.
Transport compliance draws on the IATA Dangerous Goods Regulations for air, the ICAO Technical Instructions, and the IMDG Code for sea, alongside the UN Model Regulations. Customs treatment is set by each destination country separately.
Common Reasons Lithium Shipments Are Held
Most holds happen at the transport gate, before customs, and the usual causes are:
- UN38.3 test summary unavailable when requested
- Incorrect UN number or classification
- Wrong packing instruction (PI 965, PI 966, PI 967)
- State of charge above the applicable air-transport limit
- Improper labelling, marking, or packaging
- SDS unavailable where a carrier, forwarder, customer, or authority requests it
A separate customs hold can then follow over HS classification, valuation, or permits. Failure at either gate can mean shipment refusal, fines, or carrier rejection. Many companies rely on efficient customs brokerage and dangerous-goods coordination to reduce the risk.
Step-by-Step: Clearing Lithium Battery Equipment
1. Identify the Chemistry and Configuration
Classification is the first step, and everything follows from it. Confirm whether the battery is lithium-ion, lithium-metal, or sodium-ion; whether it is shipped alone, packed with equipment, or contained in equipment; whether it is a vehicle or non-vehicle; the watt-hour rating or lithium content; and the transport mode. Getting this wrong is a leading cause of detention.
2. Assign the Correct Transport Entry
The UN number depends on the chemistry and configuration. Lithium-ion is UN3480 (alone) or UN3481 (packed with or contained in equipment). Lithium-metal is UN3090 or UN3091. For sodium-ion, the 67th edition of the IATA DGR introduced UN3551 (batteries shipped alone) and UN3552 (batteries packed with or contained in equipment) for cells and batteries with organic electrolyte.
Sodium-ion is a genuine trap: the UN3551 and UN3552 entries apply only to sodium-ion with organic electrolyte. Sodium-ion batteries with aqueous alkaline electrolyte fall under a different entry entirely, UN2795 (Batteries, wet, filled with alkali), which is Class 8 corrosive, not Class 9. The chemistry and electrolyte must be confirmed before classification, not assumed.
Section I vs Section II: Section I generally applies where the battery rating, quantity, or configuration requires the full dangerous-goods provisions, including the relevant declaration and packaging. Section II provides reduced requirements for qualifying smaller batteries within specified watt-hour or lithium-content limits. Do not select Section II solely because the equipment is small; confirm the rating, quantity, and packing instruction. Misapplying Section II is a frequent cause of detention.
3. Confirm the Packing Instruction
For air transport, review the relevant IATA packing instruction: PI 965 for loose lithium-ion cells, PI 966 for batteries packed with equipment, PI 967 for batteries contained in equipment, and PI 952 for battery-powered vehicles. The sodium-ion entries use related but separately specified packing instructions and special provisions, so confirm the current IATA or IMDG requirements rather than assuming the lithium-ion instruction applies automatically. For sea transport, review the applicable IMDG Code requirements, updated by Amendment 42-24 in 2026.
4. Obtain the UN38.3 Test Summary
Lithium and sodium-ion cells and batteries must satisfy the relevant requirements of the UN Manual of Tests and Criteria, part III, subsection 38.3. The document you need is the UN38.3 test summary, not necessarily a full laboratory report. It must be available for the specific cell or battery model when requested, though it does not have to travel physically attached to every package. Request the model-specific summary from the battery manufacturer or your equipment supplier when you arrange the shipment.
5. Check the State-of-Charge Rule
From 1 January 2026, the 67th edition of the IATA DGR introduced mandatory 30% state-of-charge requirements for specified air shipments. This applies to lithium-ion batteries packed with equipment under PI 966 above the 2.7 Wh threshold, where above 30% needs State approval under Special Provision A331, and to battery-powered vehicles above the applicable 100 Wh threshold.
Batteries contained in equipment under PI 967, meaning installed inside the device, follow different treatment: 30% is strongly recommended but not mandatory. A 30% limit already applied to standalone lithium-ion batteries under the applicable UN3480 air-transport provisions. Confirm the exact UN number, packing instruction, battery rating, and carrier requirements before shipment, because the rule that applies depends on the configuration.
6. Prepare the Transport Documentation
Depending on the mode and packing instruction, this may include a Dangerous Goods Declaration, air waybill or bill of lading information, the lithium-battery mark, a Class 9 label, a state-of-charge declaration where required, an SDS where requested, and access to the UN38.3 test summary. An SDS supports hazard communication but does not replace the dangerous-goods declaration, the test summary, or the customs documents. Retain the DGD and supporting records for the period required by the applicable IATA, ICAO, IMDG, national, and carrier rules.
7. Complete Customs Clearance Separately
This is the second gate. Standalone lithium-ion accumulators are often classified under a tariff provision within heading 8507, such as 8507.60 in some schedules, but equipment with an installed battery may instead be classified as the complete device, a laptop or server, not as a battery. Confirm the destination country’s tariff schedule for the specific product, along with customs value, country of origin, import permits, product approvals, importer-of-record status, and any destination-market restrictions. Our guide on importer of record vs consignee explains who carries which responsibility.
Air vs Sea Freight
Air freight faces stricter dangerous-goods scrutiny under the IATA and ICAO rules, including the 2026 state-of-charge requirements. Sea freight follows the IMDG Code, which still requires accurate UN classification, labelling, and packaging, and was tightened by Amendment 42-24 in 2026. The mode changes the ruleset, so it is a compliance decision as much as a cost one. DG-capable freight forwarding services reduce operational exposure.
The Role of the Importer of Record
It is important to be precise about what the importer of record does. The importer of record is responsible for the customs entry, valuation, classification, applicable permits, and destination-market requirements, the second gate. It does not assume every dangerous-goods obligation: the battery manufacturer provides the test data, and the consignor, or other party responsible for preparing and declaring the dangerous goods, remains responsible for the transport shipment under the applicable air, sea, or road rules. Companies entering unfamiliar markets often use an Importer of Record service to carry the customs side.
For complete shipment control, some exporters choose Delivered Duty Paid (DDP) shipping to manage duties, taxes, and clearance end to end, coordinated with the dangerous-goods side.
How Carra Globe Supports Battery Customs Clearance
Carra Globe supports global technology companies moving lithium and sodium-ion battery equipment across 175+ countries, coordinating both gates: the dangerous-goods transport side and the customs side. That includes classification review across the current UN entries, checking that the UN38.3 test summary and state-of-charge position are right, coordinating dangerous-goods documentation with the consignor or qualified shipper, and acting as your importer of record so the goods clear cleanly at destination.
Need help clearing lithium battery equipment through customs? We review UN38.3 documentation, classification, packing instructions, and importer-of-record exposure before shipment, reducing detention risk and carrier refusals. Request a lithium battery compliance review →
Frequently Asked Questions
Is UN38.3 required for sodium-ion batteries?
Yes. Sodium-ion cells and batteries covered by the applicable entries must satisfy the relevant UN Manual of Tests and Criteria, part III, subsection 38.3 requirements. The exact testing depends on the chemistry, electrolyte, and configuration.
The document to obtain is the UN38.3 test summary for the specific model, available on request.
What is the 2026 state-of-charge limit for battery vehicles?
For battery-powered vehicles (UN3556, UN3557, UN3558) above the applicable 100 Wh threshold, air transport generally requires a maximum 30% state of charge. Lower-capacity cases may differ.
Confirm the exact UN number and threshold for your vehicle before shipping.
Does a missing UN38.3 summary stop customs clearance?
More often it stops transport, not customs. If the summary cannot be produced on request, the carrier or forwarder may refuse or suspend the shipment, usually before it reaches customs.
Customs treatment of the summary varies by jurisdiction, so either way, have the model-specific summary available before dispatch.
Who is liable for battery compliance penalties?
Responsibility is distributed. The importer of record carries customs liability, while the consignor carries the transport-declaration obligations. The exact allocation depends on mode, contract, and Incoterms.
An importer of record coordinates the customs side; it does not absorb every transport obligation.
Can Carra Globe act as importer of record for sodium-ion shipments?
Yes. Carra Globe provides importer-of-record and compliance support for regulated IT hardware and current battery technologies, including lithium and sodium-ion, across 175+ countries.
We coordinate the customs side with the dangerous-goods shipper so both gates are covered.
Disclaimer: this guide is educational and does not constitute dangerous-goods or legal advice. Lithium and sodium-ion transport rules depend on the chemistry, watt-hour rating, configuration, and mode, and change over time. Confirm the current IATA DGR, ICAO Technical Instructions, IMDG Code, and destination customs requirements, or work with a qualified partner, before shipping.