Shipping Lithium Batteries — DOT / PHMSA Overview
Lithium batteries are regulated as hazardous materials when transported in commerce in the United States. The correct shipping pathway depends on the battery chemistry, energy, configuration, condition, purpose of the shipment and transport mode.
Storage and transportation are different regulatory activities.
A battery can be safely isolated or stored at a facility without the container used for that purpose automatically being suitable for transportation.
Once a lithium battery is offered for transportation in commerce, the U.S. DOT Hazardous Materials Regulations can apply. The shipper must establish the correct classification and shipping pathway before the battery leaves the site.
Isolation manages the battery while it remains at the site. Transportation introduces a different set of requirements covering classification, packaging, hazard communication, documentation, training and mode-specific restrictions.
Lithium battery transport rules contain exceptions and configuration-specific requirements. Use the current PHMSA shipper guide and applicable regulations to determine the requirements for an actual shipment.
Lithium batteries are hazardous materials in U.S. transportation.
PHMSA regulates lithium batteries under the U.S. Department of Transportation Hazardous Materials Regulations in 49 CFR Parts 171–180.
The requirements can apply when lithium batteries are offered for transportation or transported by highway, rail, aircraft or vessel. The detailed pathway then depends on the battery and shipment.
Federal hazardous-material transportation framework.
Pipeline and Hazardous Materials Safety Administration.
Hazardous Materials Regulations governing transportation in commerce.
Core requirements for lithium cells and batteries.
PHMSA explains that lithium batteries are hazardous materials and must conform to applicable HMR requirements when offered for transportation or transported in commerce.
View PHMSA guidance ↗Returns, recycling and disposal movements do not automatically fall outside transportation regulation simply because the battery is no longer being sold or used.
Start by describing what is actually being transported.
PHMSA's shipper guidance is scenario-based because the requirements change according to the type, configuration and size of the cells or batteries being shipped.
The chemistry affects the proper shipping description and applicable requirements.
A battery shipped by itself follows a different scenario from one packed with or contained in equipment.
Watt-hour rating and lithium content can affect available exceptions and package requirements.
Damaged, defective or recalled batteries can enter a more restrictive transportation pathway.
The reason for transport can affect the relevant shipping scenario and available provisions.
Mode-specific limitations can materially affect what is allowed.
Batteries shipped by themselves.
Packed with or contained in equipment.
Batteries shipped by themselves.
Packed with or contained in equipment.
UN 38.3 is a transport requirement — not a general fire-containment certification.
Section 173.185 generally requires lithium cells and batteries to be of a type that has successfully completed the applicable tests in Part III, Sub-section 38.3 of the UN Manual of Tests and Criteria.
Manufacturers also have obligations relating to lithium battery test summaries. A purchaser or shipper may therefore need access to the correct information for the battery type being transported.
Demonstrates that a battery type has completed specified transportation-related tests.
Provides defined information about the tested cell or battery type and the testing performed.
UN 38.3 does not establish the fire-containment capability of a battery storage cabinet.
Section 173.185 establishes lithium cell and battery classification, testing and transportation requirements.
View current regulation ↗Battery identification, Wh rating and test-summary information are easier to establish while procurement records and supplier contacts are still available than after an end-of-life or damaged battery needs to leave the site.
A compliant shipment is more than a box around a battery.
Depending on the shipment, the Hazardous Materials Regulations can address packaging, protection against short circuit and damage, package markings and labels, shipping documentation, employee training and mode-specific requirements.
Exceptions exist for some lithium battery scenarios, so these elements should be determined from the applicable shipping pathway rather than assumed to apply identically to every package.
Packaging depends on battery type, size, configuration, condition and transport mode.
Battery terminals and package contents need to be managed so the shipment does not create an uncontrolled electrical hazard.
The package should control movement and protect the battery from damage during normal transportation conditions.
The required package marking and labelling depend on the shipment classification and applicable exceptions.
Shipping papers or other documentation may be required depending on the regulatory pathway.
Employees performing regulated hazmat functions can be subject to DOT hazardous-material training requirements.
A carrier accepting a package does not remove the shipper's responsibility for properly preparing and offering the hazardous material.
PHMSA's current shipper guide uses scenario-based pathways for different battery types, configurations and sizes.
Open PHMSA shipper guide ↗Battery condition can fundamentally change the transport pathway.
PHMSA identifies damaged, defective or recalled lithium batteries as presenting a greater potential to short circuit, release heat or cause fire than undamaged batteries.
Section 173.185(f) establishes a specific pathway for lithium cells or batteries that are damaged or identified as defective for safety reasons and have the potential for dangerous evolution of heat, fire or short circuit.
Determine whether the battery is ordinary used inventory or falls into a damaged / defective / recalled condition.
Do not assume packaging suitable for an undamaged battery remains appropriate.
Batteries within this condition pathway are subject to additional transport controls.
Batteries subject to §173.185(f) may be transported by highway, rail or vessel only under that provision.
A battery that is smoking, venting, burning, rapidly heating or otherwise actively developing is an incident-management problem before it is a transport problem. Follow the site's emergency procedure and appropriate responder guidance.
Verify the transport approval, packaging specification, relevant DOT Special Permit where applicable and the exact conditions of use before relying on a container for shipment.
PHMSA confirmed in 2024 that damaged or defective batteries with the relevant dangerous heat, fire or short-circuit potential must comply with §173.185(f).
View PHMSA interpretation ↗A used battery does not stop being a transport hazard because it has no remaining commercial value.
Batteries leaving a site for recycling, disposal, manufacturer return or another end-of-life route still need to be assessed under the applicable transportation requirements.
PHMSA specifically warns that used lithium batteries can remain a fire hazard and that damaged, defective or recalled batteries require particular attention.
Confirm battery condition and the transport instructions for the return programme.
Establish whether the batteries remain serviceable or include damaged / defective material.
A recalled battery may enter the damaged / defective / recalled transport pathway depending on its safety status.
Collection programmes need an intentional transport process rather than informal accumulation of different battery conditions.
Mixing normal end-of-life batteries with damaged or suspect batteries can make transport planning harder. A site process should identify abnormal batteries earlier and route them into the appropriate assessment pathway.
PHMSA publishes specific safety material addressing transport risks associated with used and recycled lithium batteries.
View PHMSA resources ↗“Can it be shipped?” is incomplete without asking how it will travel.
Many commercial battery movements use highway transport, subject to the applicable HMR pathway.
Rail is another HMR-regulated transport mode and can be available for batteries where the applicable requirements are met.
Vessel shipments introduce mode-specific requirements and international considerations where applicable.
Air transportation contains additional lithium battery restrictions. Some battery configurations or conditions cannot use the ordinary air pathway.
If a packaging system relies on a DOT Special Permit, verify the permit number, current status, authorised use and all conditions attached to that permit. Do not assume a Special Permit applies simply because a similar-looking package has one.
A transport container should be supplied with enough documentation for the customer or hazmat professional to understand what transport pathway it supports and the limitations attached to that use.
Decide the shipping pathway before choosing the container.
Establish chemistry, Wh rating, battery type and manufacturer information.
Normal, used, recalled, damaged or defective should not be treated as interchangeable.
Battery alone, packed with equipment or contained in equipment.
Highway, rail, vessel and air can have different restrictions.
Establish the relevant UN 38.3 and battery test-summary information.
Use §173.185 and PHMSA's current shipper guidance to determine the relevant scenario.
Packaging, marks, labels and documentation should follow the identified pathway.
Resolve carrier, hazmat, permit or specialist questions before the battery leaves the facility.
The battery condition, classification and transport requirements should be understood before a packaging system is selected.
Isolation and transportation solve different parts of the problem.
A site may need one system to isolate a suspect battery and a different approved packaging pathway when that battery eventually leaves the facility.
Use the current PHMSA guidance for the actual shipment.
Transportation requirements change and shipment-specific facts matter. Confirm the current regulation and relevant PHMSA guidance before dispatch.
Start with the battery, its condition and what happens next.
Battery Safe Systems can help organise the operational requirement and identify appropriate isolation, handling and transport-system pathways for commercial battery operations.