Lithium batteries store significant amounts of energy in compact packages, making them essential for modern electronics, industrial equipment, and battery-powered systems. That same energy density also creates transportation risks that do not exist with many other products. As a result, lithium batteries are subject to extensive shipping regulations intended to reduce the potential for fire, thermal events, and transportation accidents.
Understanding these requirements is important for anyone involved in designing, manufacturing, purchasing, or transporting lithium battery packs.
Why Lithium Batteries Are Regulated During Transportation
All batteries are considered potentially hazardous during transportation because they store electrical energy. Lithium batteries require additional attention because a damaged or improperly handled battery can enter a condition known as thermal runaway.
Examples of lithium battery shipping labels.
Thermal runaway occurs when the internal temperature and pressure of a battery rise faster than the system can dissipate heat. If the event continues unchecked, the battery can fail, ignite, or potentially explode.
Conditions that can contribute to thermal runaway include:
- Physical damage or puncture
- Internal or external short circuits
- Excessive heat
- Improper handling during transportation
Because these risks remain present even when a battery is not actively powering a device, transportation regulations focus heavily on packaging, battery condition, labeling, and handling procedures.
Which Batteries Are Covered by Shipping Regulations?
For transportation purposes, the term "lithium battery" generally refers to multiple battery chemistries that share similar shipping concerns.
Lithium metal batteries, lithium-ion batteries, and related lithium-based chemistries are often treated under similar transportation frameworks. While the individual chemistries differ in construction and performance, many shipping requirements, restrictions, and labeling obligations apply across the broader lithium battery category.
Shipping Requirements Depend on the Mode of Transportation
One of the most important considerations is that shipping requirements vary depending on how the battery is transported.
Ground, air, and other transportation methods may be subject to different restrictions. In addition, batteries that are damaged, defective, or recalled are often subject to more stringent requirements than batteries in normal serviceable condition.
Batteries known to be damaged, defective, or recalled are restricted to ground transportation under certain carrier requirements and may be prohibited from shipment to specific locations during certain periods of the year.
Because transportation requirements can vary by carrier, destination, and battery condition, shipping requirements should always be confirmed before shipment.
Air Transportation Requirements for Lithium Batteries
Air transportation is subject to specific regulations intended to minimize risk during flight.
Reference guidance published by the International Air Transportation Association (IATA), which establishes standards that influence airline transportation requirements worldwide.
IATA specifically states that:
- No more than two lithium batteries may be included in a parcel.
- Batteries must remain installed within the equipment they power.
- Devices containing batteries must be protected from accidental activation during transport.
Using the example provided by IATA, a lithium-ion battery shipped with a laptop must remain installed in the laptop rather than being packaged separately.
These requirements are intended to reduce battery movement, minimize short-circuit risks, and improve overall transportation safety.
Packaging, Labeling, and Documentation Requirements
Proper documentation and package marking are fundamental elements of lithium battery transportation.
Several pieces of information may be required as part of the shipping process:
- Net weight in kilograms
- UN number
- Proper shipping name
- Shipper and consignee name and address
- UN specification packaging as required by PGII standards
- Completed lithium battery mark or lithium battery label
Transportation providers use this information to identify the contents of the shipment and ensure that batteries are handled according to applicable safety requirements.
Capacity and State of Charge Restrictions
Shipping eligibility is not determined solely by battery chemistry. Battery capacity and state of charge can also influence transportation requirements.
Certain carrier requirements restrict shipments based on watt-hour ratings. For example, in which cells greater than 20Wh and batteries equal to or less than 100Wh are accepted under specific carrier criteria.
Batteries must not exceed 30% of their rated design capacity state of charge during shipment.
These limitations are intended to reduce the severity of a potential thermal event if a battery is damaged during transportation.
Training and Certification Requirements
The transportation of lithium batteries is regulated by the Department of Transportation, and states that individuals responsible for shipping lithium batteries must be trained and certified.
Training programs are designed to help personnel understand:
- Packaging requirements
- Hazard communication procedures
- Classification of lithium cells and batteries
- Requirements for handling damaged, defective, or recalled batteries
- Transportation documentation requirements
Proper training helps reduce compliance errors and supports safe handling throughout the shipping process.
Regulatory Developments and Transportation Safety
The Department of Defense issued updated transportation safety standards in 2014 that addressed several lithium battery transportation concerns.
These updates included:
- Expanded hazardous communication packaging requirements
- New shipping descriptions for lithium metal and lithium-ion batteries
- Updated requirements for batteries transported for disposal or recycling
- New provisions for damaged, defective, and recalled batteries
- Revised transportation requirements for small and medium lithium cells transported with related equipment
These updates reflect the ongoing evolution of lithium battery transportation regulations as battery usage continues to expand across industries.
Considerations for Individual Travelers
Transportation restrictions are not limited to commercial shipments. Lithium batteries are no longer permitted in checked airline baggage and must be carried onboard by passengers. This requirement provides access to fire suppression equipment in the event of an in-flight battery incident.
While private individuals may not always be subject to the same commercial shipping requirements as battery manufacturers or distributors, many transportation restrictions are effectively enforced through airline, carrier, and logistics-provider policies.
Summary
Lithium batteries have become an essential technology across consumer, industrial, and commercial markets. As battery usage continues to grow, transportation requirements remain a critical part of ensuring safety throughout the supply chain.
Shipping regulations can vary depending on battery chemistry, battery condition, transportation method, package configuration, and destination. Understanding applicable requirements before shipment helps reduce delays, avoid compliance issues, and support the safe transportation of lithium battery products.
Key Takeaways
- Lithium batteries are hazardous goods: Because of risks like thermal runaway, overheating, or puncture, shipping rules treat all lithium-based chemistries (lithium metal, lithium-ion, etc.) as dangerous goods.
- Strict regulations vary by transport method: Air shipments are governed by IATA rules (e.g., max two batteries per parcel, must remain in equipment, device powered off), while defective or recalled batteries are restricted to ground transport.
- Documentation and labeling are mandatory: Packages must include UN number, shipping name, shipper/consignee info, packaging per PGII standards, and the correct lithium battery mark or label.
- Capacity and charge limits apply: FedEx and other carriers enforce watt-hour restrictions (≤100Wh for most shipments), and batteries are typically limited to ≤30% state of charge during shipping.
- Training and compliance are required: The U.S. Department of Transportation mandates certification to ship lithium batteries, with training covering packaging, hazardous communication, and handling defective or recalled cells.
