The Ultimate DIY Guide: Building Your Dream E-Bike

Lithium batteries are regulated cargo. A shipment that arrives without the correct testing, labeling, or documentation can be rejected at the airport, delayed at customs, or — in the worst case — become a safety incident in transit. For B2B buyers importing replacement batteries in volume, understanding how lithium shipments work is not optional paperwork. It is part of the product spec.

This guide explains the essentials: the UN38.3 test requirement, the UN numbers on your shipping documents, state-of-charge limits, and what to ask your supplier before your first container or air consignment ships.

Lithium battery consignments must be tested, classified, documented, and packaged correctly before they ship.

Why Lithium Batteries Are Regulated

Lithium-ion cells store a lot of energy in a small space. If a cell is damaged, overcharged, or poorly manufactured, it can overheat and ignite. Because of this, international transport rules treat lithium batteries as dangerous goods under the UN Model Regulations, enforced through:

• IATA Dangerous Goods Regulations (DGR) — air freight.
• IMDG Code — sea freight.
• ADR / RID — road and rail in Europe.

The rules cover everything from cell testing to the label on the box. Most import problems trace back to one of four gaps: missing UN38.3 test reports, wrong UN number classification, missing or incorrect documentation, and incorrect packaging.

UN38.3: The Non-Negotiable Test

Before any lithium cell or battery can be transported internationally, it must pass the UN38.3 testing regime — eight tests defined in Section 38.3 of the UN Manual of Tests and Criteria:

1. T1 — Altitude simulation
2. T2 — Thermal test (temperature cycling)
3. T3 — Vibration
4. T4 — Shock
5. T5 — External short circuit
6. T6 — Impact / crush
7. T7 — Overcharge
8. T8 — Forced discharge

The test report is issued per cell model and per battery assembly. When a supplier says "we have certificates," ask whether the test report covers your model — a report for one pack does not automatically cover another configuration.

UN3480 or UN3481: Know Your Number

• UN3480 — lithium-ion batteries shipped on their own (standalone packs).
• UN3481 — lithium-ion batteries contained in equipment, or packed with equipment.

Replacement battery cartons are almost always UN3480. The classification affects the transport document, the labels required, and the packing instructions the carrier applies.

State of Charge: The 30% Rule

For transport by air, most lithium-ion batteries must be shipped at a state of charge (SoC) not exceeding 30% of rated capacity. This is a safety measure — a partially charged cell releases far less energy in a failure. Confirm with your supplier:

• That packs are discharged to ≤30% SoC before air shipment, and
• That the voltage shown on the packing documentation matches a ≤30% charge level.

Sea freight allows higher states of charge, but the 30% discipline is still good practice and reduces insurance friction.

Documentation: What a Clean Shipment Carries

A properly documented lithium battery consignment typically includes:

• UN38.3 test report summary (per model).
• MSDS / SDS — safety data sheet matching the exact product and destination.
• Dangerous goods declaration — required for air freight (Shipper's Declaration for Dangerous Goods).
• Transport document with the correct UN number, packing group, and quantity.
• Certificate of conformity where the destination market requires it (e.g., CE for EU markets).

Documentation is model- and destination-specific. The same battery shipped to the EU and to Australia can require different sets. Ask your supplier to match documents to the exact order before dispatch — never assume one certificate covers everything.

Packaging and Labeling

Packaging for lithium batteries must meet the UN performance standards for the relevant packing instruction (e.g., PI965–PI970 in air freight). The carton should carry:

• The lithium battery handling mark (the black-and-orange symbol with "LITHIUM ION BATTERIES" and a phone number).
• The correct UN number and label for the classification.
• The "DO NOT LOAD OR TRANSPORT PACKAGE IF DAMAGED" instruction where required.

Overpack marking is another common error: if cartons are combined on a pallet, the overpack must be marked and labeled too.

UN-spec packaging protects the cells in transit and keeps the shipment compliant.

Air vs. Sea: What Changes

Air freight is the strictest mode: 30% SoC limits, shipper's declaration, and tighter packing instructions apply to almost every tool battery. Sea freight (IMDG) allows more flexibility on charge level and some documentation differences, and is the default for large-volume orders. Expect longer lead times for sea — and plan lithium battery orders around the mode of transport from the start.

What to Ask Your Supplier Before You Order

1. Does the UN38.3 test report cover this exact battery model?
2. Which UN number applies — UN3480 or UN3481?
3. What is the shipped state of charge, and can you confirm it in writing for air freight?
4. Which documents will you provide for my destination country and transport mode?
5. Is the packaging UN-spec compliant and correctly labeled and marked?

GeB Power confirms certificates and shipping documents by battery model and destination before production and dispatch. See the shipping and document policy for the general framework, and submit your order details to request a quote for a model-specific document check.

Compliance Is Part of the Product

A battery that cannot be shipped is not a product — it is a warehouse problem. Buyers who verify testing, documentation, and packaging before ordering avoid the two most expensive outcomes in international trade: cargo rejection and delayed delivery. When comparing suppliers, treat "documents confirmed by model and destination" as a core requirement, not a courtesy.

Need a model checked? Send the battery reference, quantity, destination, and transport mode to GeB Power, or browse the replacement battery catalog to start.