Lithium metal batteries are widely used in medical devices, military equipment, industrial electronics, watches, sensors, and backup power systems. However, due to their chemical properties and fire risk, they are heavily regulated under international dangerous goods transport rules.

Understanding the correct lithium battery shipping requirements is essential for manufacturers, exporters, freight forwarders, and e-commerce businesses involved in global battery logistics.

This guide explains the international shipping rules for lithium metal batteries, including classification, packaging, documentation, air transport restrictions, and the critical role of UN38.3 testing.

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1. What Are Lithium Metal Batteries?

Lithium metal batteries are non-rechargeable batteries that use metallic lithium as the anode.

Common examples include:

• Coin cell batteries
• Medical device batteries
• Military communication batteries
• Industrial backup batteries
• Camera and electronic device batteries

Unlike lithium-ion batteries, lithium metal batteries contain metallic lithium, which increases fire risk under certain transport conditions.

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2. UN Numbers for Lithium Metal Batteries

International dangerous goods regulations classify lithium metal batteries under the following UN numbers:

UN Number	Description
UN3090	Lithium metal batteries shipped alone
UN3091	Lithium metal batteries packed with or contained in equipment

These classifications are defined under the United Nations Dangerous Goods Model Regulations.

UN Dangerous Goods Model Regulations

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3. Why Lithium Metal Batteries Are Regulated

Lithium metal batteries present transport risks including:

• Short circuits
• Thermal events
• Fire hazards
• Heat generation under damage conditions
• Difficult fire suppression during air transport

Because of these risks, lithium metal batteries are classified as Class 9 Dangerous Goods in most transport systems.

Airlines and logistics providers apply especially strict rules to lithium battery shipping involving lithium metal chemistry.

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4. The Critical Role of UN38.3 Testing

A mandatory requirement for international lithium battery shipping is compliance with UN38.3.

What Is UN38.3?

UN38.3 is a transport safety testing standard established by the United Nations for lithium batteries.

The testing program includes:

• Altitude simulation
• Thermal testing
• Vibration testing
• Shock testing
• External short-circuit testing
• Impact/crush testing
• Overcharge testing
• Forced discharge testing

Why UN38.3 Matters

Lithium metal batteries cannot legally enter international transport unless they pass UN38.3 testing.

Without UN38.3:

• Airlines may reject shipments
• Freight forwarders may refuse cargo
• Customs clearance may fail
• Insurance coverage may become invalid

UN38.3 compliance is one of the most important legal foundations in lithium battery shipping.

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5. IATA Rules for Lithium Metal Battery Air Shipping

Air transport regulations are primarily governed by the International Air Transport Association (IATA).

IATA Dangerous Goods Regulations

Relevant Packing Instructions

Battery Type	Packing Instruction
UN3090	PI968
UN3091 packed with equipment	PI969
UN3091 contained in equipment	PI970

These packing instructions define:

• Packaging requirements
• Quantity limitations
• Labeling standards
• Documentation obligations
• Passenger aircraft restrictions

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6. Restrictions on Air Transport

Lithium metal batteries face stricter air transport limitations compared to many lithium-ion batteries.

Common restrictions include:

• Some standalone lithium metal batteries are forbidden on passenger aircraft
• Cargo aircraft only restrictions may apply
• Quantity limits per package
• Strict state-of-charge and packaging controls
• Additional carrier approval requirements

Many carriers impose even stricter rules than IATA minimum standards.

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7. Packaging Requirements for Lithium Metal Batteries

Proper packaging is essential for safe lithium battery shipping.

Core packaging requirements include:

Short Circuit Protection

• Battery terminals must be insulated
• Individual packaging may be required

Strong Outer Packaging

• Durable UN-standard packaging
• Impact-resistant materials

Movement Prevention

• Batteries must not shift during transport

Equipment Protection

• Devices containing batteries must be protected against accidental activation

Improper packaging is one of the leading causes of lithium battery shipment rejection.

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8. Labeling Requirements

Lithium metal battery shipments may require:

• Lithium Battery Mark
• Class 9 Hazard Label
• Cargo Aircraft Only Label (if applicable)
• Proper shipping name
• UN number marking

Examples:

• UN3090
• UN3091

Labeling errors can lead to delays, penalties, or cargo refusal.

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9. Documentation Requirements

Typical shipping documents include:

• UN38.3 test summary
• Material Safety Data Sheet (MSDS/SDS)
• Shipper’s Declaration for Dangerous Goods
• Air waybill
• Product specifications

Accurate documentation is critical in international lithium battery shipping compliance.

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10. Carrier Rules (UPS, FedEx, DHL)

Major logistics companies enforce strict lithium battery transport policies.

UPS

UPS Dangerous Goods Shipping Information

UPS generally requires:

• Approved dangerous goods account
• Correct packaging and labeling
• Compliance with IATA and local regulations

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FedEx

FedEx Dangerous Goods Shipping Guide

FedEx applies:

• Lithium battery pre-approval processes
• Documentation checks
• Packaging inspections

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DHL

DHL Dangerous Goods Shipping Overview

DHL may:

• Restrict certain lithium metal battery shipments
• Require contractual approval
• Limit destinations and transport routes

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11. Common Mistakes in Lithium Metal Battery Shipping

Common compliance failures include:

• Missing UN38.3 documentation
• Incorrect UN classification
• Improper packaging
• Mislabeling shipments
• Declaring dangerous goods as general cargo
• Failing to follow PI968/969/970 requirements

These errors can result in shipment delays, fines, or cargo confiscation.

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12. Sea Freight vs Air Freight

Air Freight

• Faster delivery
• Strictest dangerous goods rules
• More expensive compliance requirements

Sea Freight

• Lower transport costs
• Larger shipment capacity
• IMDG Code compliance required

For large-volume lithium battery shipping, sea freight is often preferred.

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Lithium metal battery shipping is one of the most highly regulated sectors in international logistics. Due to fire and thermal risks, governments, airlines, and carriers enforce strict compliance standards covering packaging, labeling, documentation, and transport procedures.

Among all requirements, UN38.3 testing is absolutely essential, serving as the global transport safety standard for lithium batteries.

Companies involved in international lithium battery shipping must fully understand UN3090, UN3091, PI968, PI969, and PI970 requirements to ensure safe, legal, and efficient transportation worldwide.

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References (Authoritative Sources)

• UN Model Regulations (UNECE)
• IATA Dangerous Goods Regulations
• ICAO Dangerous Goods Technical Instructions
• UPS Dangerous Goods Guidelines
• FedEx Dangerous Goods Information
• DHL Dangerous Goods Overview