Why Lithium Batteries Are Regulated
In 2010, a UPS Boeing 747 crashed in Dubai, killing both pilots. The cause: lithium batteries in the cargo hold caught fire, generating heat and toxic gases that overwhelmed the aircraft. Since then, international aviation authorities have dramatically tightened regulations on lithium battery shipments. Lithium batteries are now one of the most tightly regulated items in commercial shipping.
The regulations are complex, differ by battery type, quantity, and mode of transport, and carry severe penalties for non-compliance. This guide covers what every shipper needs to know.
Two Battery Types: Very Different Rules
All regulations start with the distinction between two battery types:
- Lithium ion (Li-ion): Rechargeable. Found in phones, laptops, power tools, electric vehicles. UN numbers: UN 3480 (batteries alone), UN 3481 (batteries in equipment).
- Lithium metal (Li-metal): Non-rechargeable. Found in watches, some cameras, military equipment, medical devices. UN numbers: UN 3090 (batteries alone), UN 3091 (batteries in equipment).
Lithium metal batteries have stricter limits because they contain metallic lithium, which reacts violently with water. Even after being "used," they can retain energy and pose fire risk.
IATA Regulations: Air Shipment Rules
The International Air Transport Association (IATA) publishes the Dangerous Goods Regulations (DGR) that govern all air freight. Key provisions for 2025:
Lithium Ion Batteries Alone (UN 3480)
- Maximum state of charge (SOC): 30% for cargo aircraft (IATA prohibition added 2016)
- Cells: ≤20 Wh; Batteries: ≤100 Wh for passenger aircraft
- Batteries over 100 Wh but ≤300 Wh: cargo aircraft only, limited quantity per package
- Batteries over 300 Wh: forbidden on any aircraft
Lithium Ion Batteries in Equipment (UN 3481)
- Permitted on passenger aircraft when within IATA watt-hour limits
- Laptops, phones, cameras: generally allowed in luggage and small parcel shipping when they meet the limits
- The device must be switched off (not sleep mode) during air transport
Watt-Hour (Wh) Calculation
Watt-hours determine which regulatory tier applies. The formula:
Wh = Voltage (V) × Ampere-hours (Ah)
Or: Wh = Voltage × mAh ÷ 1,000
Common device battery sizes:
| Device | Typical Battery | Wh | Air Shipping Status |
|---|---|---|---|
| Smartphone | 3.8V × 3,000mAh | 11.4 Wh | Permitted (passenger + cargo) |
| Laptop | 11.1V × 6,600mAh | 73 Wh | Permitted (passenger + cargo) |
| E-bike battery | 48V × 10Ah | 480 Wh | Forbidden on all aircraft |
| Portable power station | 24V × 20Ah | 480 Wh | Forbidden on all aircraft |
| Camera battery | 7.2V × 1,800mAh | 13 Wh | Permitted |
USPS, UPS, and FedEx Domestic Rules
For domestic ground shipments, regulations are less restrictive but still important:
USPS
- Lithium batteries/devices cannot be shipped via USPS air services (Priority Mail Express, First Class Package International, etc.) unless they meet small quantity exceptions
- USPS ground (Retail Ground): lithium batteries permitted with limitations
- International USPS: very restrictive — most countries prohibited or severely limited
UPS and FedEx Ground
- Lithium ion batteries in equipment: generally shippable by ground with standard packaging and proper marking
- Standalone batteries: require hazmat packaging, proper labeling (Class 9 label), and shipping papers for large quantities
- Both carriers have specific quantity limits per package and shipper certification requirements for larger shipments
Packaging Requirements
Improperly packaged lithium batteries are the most common compliance failure:
- Protect against short circuit: Terminals must be protected (tape over terminals, individual plastic bags, or original retail packaging)
- Prevent movement: Batteries must not be able to shift and contact each other or metal surfaces
- UN specification packaging: Required for large quantity shipments (not required for Section II small quantities in equipment)
- Labeling: Class 9 hazmat label required for regulated quantities; lithium battery mark (new requirement since 2019) required even for small quantity exceptions
Penalties for Non-Compliance
The penalties for shipping lithium batteries in violation of DOT or IATA regulations are severe:
- DOT civil penalties: Up to $87,503 per violation per day for serious violations
- Criminal penalties: Up to $500,000 fine and 5 years imprisonment for knowing violations
- Carrier fines: Carriers caught with improperly declared batteries face their own regulator penalties and may pass costs to shippers
Bottom Line
If you ship anything containing a lithium battery — phones, laptops, power tools, cameras, toys with rechargeable batteries — you need to know these rules. Consumer electronics in retail packaging with batteries under 100 Wh in devices is generally straightforward. Standalone large batteries, e-bike batteries, and bulk battery shipments require full hazmat compliance. When in doubt, consult a DG (dangerous goods) specialist before shipping. Use our shipping calculator to identify which carriers accept your specific battery shipment, or compare carriers for hazmat-capable services.