June 23, 2026 - ADR Transport Services

How To Transport Batteries Safely

adrtransport on June 23, 2026

Batteries are one of the most tightly regulated categories of dangerous goods, and one of the most frequently transported incorrectly. From lithium-ion batteries in laptops and power tools to large EV battery packs, lead-acid batteries in vehicles, and lithium metal cells in specialist equipment, almost every business that handles battery-powered products needs to understand how to transport batteries safely and legally. This guide covers everything UK businesses need to know.

Why Battery Transport Is Regulated

Batteries, particularly lithium-ion batteries and lithium metal batteries, are classified as dangerous goods under the ADR regulations (the European Agreement Concerning the International Carriage of Dangerous Goods by Road) because they present a genuine fire and explosion risk during transport if they are damaged, incorrectly packaged, short-circuited, or exposed to excessive heat.

The risk is not theoretical. There have been numerous incidents involving battery fires during transport across all modes of transportation, in road vehicles, cargo aircraft, and ships.

The energy density of modern lithium-ion batteries means that a thermal runaway event, a self-sustaining, temperature-escalating chemical reaction within the battery, can generate intense heat and fire that is extremely difficult to extinguish. Once thermal runaway begins in one battery cell, it can propagate to adjacent cells and spread rapidly.

The dangerous goods regulations for battery transport have been progressively tightened over the past decade in response to these risks. The International Civil Aviation Organization (ICAO), the International Maritime Dangerous Goods (IMDG) Code for sea transport, and ADR for road transport have all introduced increasingly specific requirements for battery transport, covering state of charge limits, packaging specifications, labelling, and documentation.

Battery Types and Their Dangerous Goods Classification

Not all battery types are treated the same under dangerous goods regulations. Different battery chemistries present different levels of risk, and the transport requirements vary accordingly. The key distinction for regulatory purposes is between lithium-based batteries and non-lithium batteries, with lithium-based batteries subject to the most stringent requirements.

Lithium-Ion Batteries (Li-ion)

Rechargeable. Used in smartphones, laptops, tablets, power tools, e-bikes, electric vehicles, and energy storage systems. Classified as Class 9 dangerous goods. The most commonly transported battery type requiring ADR compliance in the UK.

Lithium Metal Batteries (Primary)

Non-rechargeable. Used in watches, hearing aids, calculators, military equipment, and specialist devices. Also classified as Class 9. Generally considered higher risk than lithium-ion batteries due to higher lithium content and greater reactivity.

Lithium Polymer Batteries (LiPo)

A variant of lithium-ion chemistry using a polymer electrolyte rather than a liquid one. Common in drones, RC vehicles, and consumer electronics. Classified identically to lithium-ion batteries under ADR — UN 3480 or UN 3481 depending on configuration.

Lead-Acid Batteries

Wet (flooded) lead-acid batteries are classified as Class 8 corrosive substances under ADR. Sealed valve-regulated lead-acid (VRLA) batteries are Class 9. Common in vehicles, industrial equipment, and UPS systems. Less restrictive than lithium but still regulated.

Nickel-Metal Hydride (NiMH)

Rechargeable. Found in hybrid vehicles, power tools, and consumer electronics. NiMH batteries are generally not classified as dangerous goods for transport unless they meet specific criteria for hazardous substances — check the Safety Data Sheet for the specific product.

Nickel-Cadmium (NiCd)

Rechargeable. Used in industrial equipment, power tools, and emergency lighting. NiCd batteries may be classified as Class 9 under certain conditions due to cadmium content. Check the specific UN number and Safety Data Sheet before transport.

The UN Numbers for Battery Transport

Each category of battery has a specific UN number, the four-digit code assigned under the UN dangerous goods classification system that identifies the substance or article and triggers the applicable transport requirements.

Using the correct UN number is a fundamental requirement of ADR compliance, an incorrect UN number on the transport document or outer packaging is a breach of the dangerous goods regulations.

UN Number	Proper Shipping Name	Class	Key Notes
UN 3480	Lithium ion batteries	Class 9	Standalone lithium-ion battery cells and packs, not installed in equipment. State of charge limit of 30% applies under Section II. Watt-hour limits per cell and per battery apply.
UN 3481	Lithium ion batteries packed with equipment / Lithium ion batteries contained in equipment	Class 9	Lithium-ion batteries shipped in the same outer packaging as equipment, or already installed inside equipment. Must be protected against activation and short circuit.
UN 3090	Lithium metal batteries	Class 9	Standalone lithium metal battery cells and packs. Lithium content limits per cell and per battery apply. More restrictive than lithium-ion in some contexts due to higher reactivity.
UN 3091	Lithium metal batteries packed with equipment / Lithium metal batteries contained in equipment	Class 9	Lithium metal batteries shipped with or inside equipment. Lithium content limits apply. Equipment must be protected against activation.
UN 2794	Batteries, wet, filled with acid	Class 8	Standard wet lead-acid batteries. Corrosive risk from sulphuric acid. Must be transported upright with secure, sealed vents. Subsidiary risk Class 9 in some configurations.
UN 2800	Batteries, wet, non-spillable, electric storage	Class 9	Sealed, valve-regulated lead-acid (VRLA) batteries including AGM and gel types. Less restrictive than wet acid. Common in UPS systems and mobility aids.
UN 3171	Battery-powered vehicle / Battery-powered equipment	Class 9	Vehicles or equipment powered by lithium batteries or wet batteries when transported as a complete unit — such as electric wheelchairs, e-bikes, or electric scooters. Special provisions apply.

How To Transport Lithium-Ion Batteries Safely by Road

Transporting lithium-ion batteries safely by road in the UK requires compliance with ADR Packing Instruction P903, which sets out the requirements for UN 3480 and UN 3481. The specific requirements depend on whether you are shipping under Section I (full ADR compliance) or Section II (simplified compliance for smaller batteries and quantities).

Section I: Full ADR Compliance

Section I applies to larger batteries, higher watt-hour ratings, and quantities that exceed the Section II thresholds. Under Section I, the full ADR requirements apply, including ADR-certified drivers, a complete Dangerous Goods Transport Document, and vehicle marking and placarding. Section I is typically required for:

Lithium-ion cells exceeding 20Wh per cell
Lithium-ion batteries exceeding 100Wh per battery
Large-format EV battery packs
Industrial battery systems
Consignments exceeding the Section II quantity limits

Section II: Simplified Compliance

Section II provides a reduced-requirement route for smaller batteries and lower watt-hour ratings. Under Section II, the driver is not required to hold an ADR certificate and a full transport document is not required, however, the lithium battery handling mark must appear on the outer packaging, and a basic transport document with the UN number and battery type is still required. Section II applies to:

Lithium-ion cells not exceeding 20Wh
Lithium-ion batteries not exceeding 100Wh
Subject to quantity limits per package

State of Charge (SOC) Requirements

One of the most critical, and most frequently overlooked, requirements for the transport of lithium batteries under Section II is the state of charge limit. Lithium-ion batteries transported as UN 3480 (standalone) under Section II must not exceed 30% of their rated capacity at the time of transport.

This requirement exists because the thermal runaway risk from a short circuit or physical damage is proportional to the energy stored in the battery. A battery at 30% SOC presents a significantly lower risk than one at full charge. The 30% SOC limit must be applied before the battery is packaged, it cannot be adjusted during transit.

Damaged, Defective, and End-of-Life Batteries

Batteries that are damaged, defective, recalled, or showing signs of a safety concern, including leaking, venting, deformation, or evidence of previous overheating, present a substantially higher transport risk than undamaged batteries. They are subject to enhanced requirements under ADR Special Provision 376, which applies specifically to lithium batteries that present a safety concern.

Do not transport damaged lithium batteries in standard packaging.

Standard UN-approved packaging for batteries is designed for undamaged goods in normal condition. It is not sufficient for batteries that are leaking, venting, deformed, hot to the touch, or showing any sign of damage or thermal activity. Attempting to transport a damaged lithium battery in standard packaging is both a compliance failure and a serious fire risk. Always seek specialist advice before attempting to move any suspect battery.

ADR Special Provision 376: Requirements for Damaged Batteries

Under Special Provision 376, lithium batteries that are known or suspected to be damaged or defective must be:

Transported in a salvage container or equivalent outer packaging that is capable of containing a thermal event, typically a metal container with a lid, or a specialised fire-containment battery transport bag
Transported with a minimum quantity of non-combustible, thermally insulating material around the battery to absorb any leakage
Each damaged battery transported in its own individual outer packaging, they must not be grouped together
Accompanied by additional documentation noting the damage and the special provision being applied
Subject to emergency response procedures appropriate to the risk, the driver must be briefed on the nature of the battery and the response actions required.

End-of-Life and Waste Batteries

Batteries being transported for recycling, treatment, or disposal are subject to both the ADR dangerous goods requirements and, where they meet the definition of waste, the Hazardous Waste Regulations.

Under the Waste Batteries and Accumulators Regulations 2009, batteries transported as waste in the UK must be accompanied by appropriate waste transfer documentation in addition to the ADR transport document.

Our battery transport service covers both the ADR and waste regulatory requirements for end-of-life battery collections.

What Is Classified As Dangerous Goods?

adrtransport on June 23, 2026

Many businesses that handle, ship, or receive chemicals, batteries, gases, paints, cleaning products, or industrial materials are already working with dangerous goods, whether they know it or not. Understanding how dangerous goods are classified under UK law is essential for anyone involved in their production, distribution, or transport. This guide explains exactly what counts as a dangerous good, how goods are classified, and what that classification means in practice.

What Is a Dangerous Good: The Legal Definition

Under the ADR regulations, the European Agreement Concerning the International Carriage of Dangerous Goods by Road — a dangerous good is defined as any substance or article that, due to its physical, chemical, or biological properties, presents a hazard to human health, safety, property, or the environment when transported.

The classification system for dangerous goods originates from the United Nations Model Regulations for the Transport of Dangerous Goods, which forms the international framework on which all major transport regulations, including ADR for road transport in the UK, are based. When a substance or article is assigned a UN number, it has been formally identified as a dangerous good under this international system.

In practical terms, a dangerous good is any substance or article that appears in the UN Dangerous Goods List, or that meets the classification criteria for one of the nine dangerous goods classes set out in ADR. The classification is based on the inherent physical or chemical properties of the substance, not on how carefully it is handled, how securely it is packaged, or how experienced the person transporting it might be.

The Two Key Questions: Substance or Article?

The ADR regulations make an important distinction between a substance and an article. Understanding this distinction helps clarify why some goods that don’t look dangerous at first glance are still classified as dangerous goods.

Dangerous Substances

A dangerous substance is a chemical or material that presents a hazard due to its inherent properties, for example, its flammability, corrosiveness, toxicity, reactivity with water, or ability to harm human health or the environment. Dangerous substances include liquids, solids, gases, powders, and mixtures. Examples include petrol, sulphuric acid, chlorine gas, sodium hydroxide, and hydrogen peroxide.

Dangerous Articles

A dangerous article is a manufactured item that contains or incorporates a dangerous substance or energy source, and that presents a hazard during transport. The substance itself may be contained within the article, meaning it is not immediately visible, but it still makes the article a dangerous good. Examples include lithium batteries (which contain reactive lithium chemistry), aerosol cans (which contain pressurised gas and often a flammable propellant), fire extinguishers, and airbag inflators.

Why this matters for UK businesses:

Many businesses that would never describe themselves as handling chemicals are, in fact, regularly transporting dangerous articles. A business that ships laptops containing lithium-ion batteries is transporting dangerous goods. A cleaning company that moves aerosol products between sites is transporting dangerous goods. A motor trade business that dispatches vehicle airbag modules is transporting dangerous goods. The article classification means that many goods that appear harmless in their packaged state are still subject to ADR requirements when transported.

The Nine Dangerous Goods Classes

The UN Model Regulations, and the ADR framework based on them, divide all dangerous goods into nine classes according to the primary type of hazard they present. These are the classes used by the transportation of dangerous goods regulatory system worldwide whether by road, sea, rail, or air.

Class	Hazard Type	Description	UK Examples
Class 1	Explosives	Substances or articles that can explode, deflagrate, or react rapidly to produce gas, heat, or light. Divided into six divisions (1.1–1.6) based on the type and scale of explosion risk.	Fireworks, ammunition, detonators, signal flares, airbag inflators
Class 2	Gases	Substances that are gaseous at 50°C or have a vapour pressure exceeding 300 kPa at 20°C. Divided into flammable gases (2.1), non-flammable non-toxic gases (2.2), and toxic gases (2.3).	LPG, oxygen cylinders, aerosol cans, refrigerant gases, acetylene, carbon dioxide cartridges
Class 3	Flammable Liquids	Liquids with a flash point of not more than 60°C, or liquids transported at elevated temperatures. The flash point — the temperature at which a liquid gives off enough vapour to ignite — is the key classification criterion.	Petrol, diesel, solvents, paints, lacquers, alcohols, acetone, adhesives
Class 4	Flammable Solids	Three subdivisions: 4.1 (flammable solids and self-reactive substances), 4.2 (substances liable to spontaneous combustion), and 4.3 (substances that emit flammable gases on contact with water).	Matches, metal powders (aluminium, magnesium), calcium carbide, sodium metal
Class 5	Oxidising Substances & Organic Peroxides	Class 5.1: substances that release oxygen and can cause or intensify fire in other materials. Class 5.2: organic peroxides that can decompose exothermically and may be explosive, flammable, or toxic.	Hydrogen peroxide, ammonium nitrate, sodium hypochlorite (bleach), potassium permanganate
Class 6	Toxic & Infectious Substances	Class 6.1: substances that can cause serious injury or death to human health through inhalation, ingestion, or skin contact. Class 6.2: infectious substances containing pathogens capable of causing disease in humans or animals.	Pesticides, herbicides, industrial reagents, cyanides, biological specimens, medical waste
Class 7	Radioactive Material	Substances containing radionuclides where both activity concentration and total activity exceed specified thresholds. Requires specialist licensing and transport provisions.	Medical isotopes, nuclear material, radiography sources, smoke detector elements (in large quantities)
Class 8	Corrosive Substances	Substances that, by chemical action, cause severe damage to living tissue or materially damage or destroy other goods or the means of transport. Assessed by their ability to damage skin and metal.	Sulphuric acid, hydrochloric acid, sodium hydroxide (caustic soda), battery acid, industrial cleaning chemicals
Class 9	Miscellaneous Dangerous Goods	Substances and articles that present a danger during transport but do not meet the criteria for any other class. This is a broad category that includes many modern commercial goods.	Lithium batteries, dry ice, magnetised materials, elevated temperature substances, environmentally hazardous substances

A note on Class 4.3 — substances that emit flammable gases on contact with water:

This is one of the less well-known dangerous goods classifications but covers a range of substances that UK industrial businesses may handle regularly. Substances in Class 4.3, sometimes called “water-reactive” or “dangerous when wet” substances, react with moisture or water to emit flammable gases, creating a fire or explosion hazard. Examples include sodium metal, potassium, calcium carbide, and certain metal powders. If a specific chemical in your inventory reacts vigorously with water, check whether it falls into Class 4.3 before assuming it does not require ADR transport.

How Dangerous Goods Are Classified in Practice

The classification of a dangerous good follows a defined process based on the substance’s chemical and physical properties. For most common commercial substances, the classification has already been determined and published in the UN Dangerous Goods List, a comprehensive database that forms the core of ADR and its equivalents for other transport modes.

The UN Dangerous Goods List

The UN Dangerous Goods List assigns each classified substance or article a UN number, a four-digit code that uniquely identifies it, along with a proper shipping name, primary hazard class, any subsidiary risk class, packing group, and applicable special provisions. For example, UN 1263 covers paints and related products as a Class 3 flammable liquid, and UN 3480 covers lithium ion batteries as a Class 9 miscellaneous dangerous good.

If your substance appears in the UN Dangerous Goods List with a UN number, it is a classified dangerous good and must be transported in accordance with the requirements for that class and packing group.

Self-Classification

For substances not already listed in the UN Dangerous Goods List, for example, new chemical compounds or proprietary formulations, the manufacturer or supplier is responsible for determining whether the substance meets the classification criteria for any dangerous goods class. This process is called self-classification and involves testing the substance against the physical, chemical, and toxicological criteria set out in the UN Model Regulations and the ADR.

In practice, most UK businesses will be working with substances that have already been classified by their manufacturer or supplier. The classification information is communicated through the product’s Safety Data Sheet.

Mixtures and Preparations

Many commercial products are mixtures of substances rather than pure chemicals. Where a mixture contains one or more classified substances, the mixture itself may be classified as dangerous depending on the concentration of the hazardous component.

What Dangerous Goods Classification Means for UK Transport

Once a substance or article has been classified as a dangerous good, the classification triggers a specific set of requirements for its transportation of dangerous goods by road in the UK under ADR.

These requirements are not optional, they are legal obligations that apply to everyone involved in the movement of the goods, including the sender, the carrier, and in some cases the recipient.