Shipping Lithium Batteries: Hazmat Compliance Guide

Lithium batteries are in practically everything — phones, laptops, power tools, e-bikes, vape devices, wireless headphones, portable chargers. If you sell any electronic product, you're almost certainly shipping lithium batteries. And lithium batteries are classified as hazardous materials by every major carrier and the Department of Transportation, which means there are specific rules about how they must be packaged, labeled, and declared. Ignore these rules and your packages get rejected, returned, or in the worst case, cause a fire in a delivery truck.

Why Lithium Batteries Are Regulated

Lithium batteries store a lot of energy in a small space, which is what makes them useful but also what makes them dangerous. When damaged, improperly manufactured, or exposed to extreme temperatures, they can experience thermal runaway — a self-reinforcing chain reaction where the battery overheats, swells, and potentially catches fire. This happens in transit more often than you'd think, because packages get dropped, crushed, and stacked under heavy loads.

The regulations exist specifically because of real incidents. Multiple cargo plane fires and several delivery truck fires have been traced back to improperly shipped lithium batteries. The FAA estimates that lithium battery incidents on aircraft occur multiple times per year.

The Two Types of Lithium Batteries

Regulations distinguish between lithium-ion batteries (rechargeable — the kind in phones and laptops) and lithium metal batteries (non-rechargeable — the kind in watches, calculators, and some medical devices). The rules are similar but not identical, and the packaging requirements differ based on watt-hour rating for lithium-ion or lithium content for lithium metal.

Small lithium-ion batteries (under 100 watt-hours) and small lithium metal batteries (under 2 grams of lithium) fall under less restrictive shipping rules. These cover the vast majority of consumer electronics — smartphone batteries are typically 10 to 15 watt-hours, laptop batteries are 40 to 60 watt-hours. Batteries above these thresholds (large power tool batteries, e-bike batteries, industrial equipment) face stricter requirements including potential air shipping restrictions.

Carrier Rules

USPS, UPS, and FedEx all allow lithium batteries but with specific conditions. The rules vary by whether the battery is installed in the device, packed with the device but not installed, or shipped as a standalone battery.

Batteries installed in devices have the fewest restrictions. A phone in its box with the battery inside ships with minimal additional requirements — proper outer packaging, no damage to the device, and the correct lithium battery handling label on the outside of the package. Most e-commerce sellers shipping electronics with built-in batteries fall into this category.

Batteries packed with equipment (in the same box but not installed in the device) require the battery terminals to be protected against short circuit — typically by keeping the battery in its original packaging or wrapping the terminals with tape. The outer package needs a lithium battery mark (a specific label showing that the package contains lithium batteries).

Standalone batteries shipped without any device face the strictest rules. Each battery must be individually protected, placed in inner packaging that prevents movement and short circuits, and the outer package must be marked with the lithium battery handling label. USPS limits standalone lithium batteries to ground transportation only — they cannot be shipped via Priority Mail Express or any air service.

Packaging Requirements

Regardless of category, several packaging rules apply universally. The package must protect the batteries from damage during normal transportation, including drops and stacking. Terminal protection is required — exposed battery terminals must be taped, capped, or otherwise insulated to prevent short circuits. The outer package must pass a 4-foot drop test without the batteries being damaged or released.

The lithium battery handling mark (a specific diamond-shaped label with a battery icon) must be placed on the outside of the package for batteries packed with equipment and standalone batteries. The mark must be at least 120mm x 110mm (about 4.7 x 4.3 inches). You can print these labels or order pre-printed stickers from packaging suppliers.

Practical Guidance for E-Commerce Sellers

For most sellers shipping consumer electronics with installed batteries, compliance is straightforward: pack the product securely, ensure the device is protected and won't turn on during transit (tape over power buttons if necessary), and apply the lithium battery handling label to the outside of the box. No special permits, no hazmat fees, no carrier restrictions.

For sellers shipping replacement batteries or power banks as standalone products, the requirements are stricter but still manageable. Keep each battery in its retail packaging or individually wrap it, protect terminals with tape, use a rigid outer box with cushioning, and apply the handling label. Ship ground only via USPS; UPS and FedEx allow air shipping for small lithium-ion batteries under certain conditions.

atoship flags products containing lithium batteries during label creation, ensures the correct shipping services are selected (blocking air services when required), and reminds you to apply the lithium battery handling label before shipping.