A lab does not have to ship raw batteries to be subject to lithium battery shipping regulations. Sending a portable spectrometer, a data logger, a backup power pack, or almost any battery-powered instrument off-site — for repair, loan, field deployment, or disposal — triggers the same federal and international dangerous goods framework that governs bulk battery freight. This guide explains how that framework classifies lithium batteries, what the resulting packaging and documentation obligations are, and where labs most often get it wrong.
Why lithium batteries are regulated as dangerous goods
Lithium cells store energy at high density and can enter thermal runaway — a self-sustaining, escalating heat reaction — if they are damaged, short-circuited, overcharged, or manufactured with an internal defect. In an enclosed cargo hold, that failure mode has caused real fires, which is why lithium batteries in all forms are assigned to Hazard Class 9 (Miscellaneous Dangerous Goods) under the UN Recommendations on the Transport of Dangerous Goods (the ‘UN Model Regulations’), and why every major carrier and mode of transport regulates them under that same underlying framework, with mode-specific implementing rules layered on top:
- Air — the International Civil Aviation Organization’s (ICAO) Technical Instructions, implemented commercially through the International Air Transport Association’s (IATA) Dangerous Goods Regulations (DGR), which most airlines require shippers to follow directly.
- Ground, in the US — the Pipeline and Hazardous Materials Safety Administration’s (PHMSA) Hazardous Materials Regulations, 49 CFR Parts 171–180, which incorporate lithium-battery-specific special provisions.
- Sea — the International Maritime Dangerous Goods (IMDG) Code, published by the International Maritime Organization.
All three frameworks classify lithium batteries the same underlying way and require the same underlying UN-numbered identification, but each mode layers its own packaging, marking, quantity, and documentation specifics on top — a shipment compliant for ground transport is not automatically compliant for air, and vice versa. Because the requirements are revised on a regular cycle (IATA reissues the DGR annually), always confirm the current thresholds and packing instructions against your carrier’s current requirements before shipping rather than relying on a fixed number from any single source, including this page.
The four UN numbers, and why the distinction matters
Lithium batteries are split first by chemistry, then by whether they ship on their own or inside/alongside equipment:
- UN 3090 — Lithium metal batteries, shipped by themselves (not packed with or contained in equipment). Non-rechargeable lithium chemistries (common in coin cells, some field instrumentation, and emergency backup devices) fall here.
- UN 3091 — Lithium metal batteries packed with, or contained in, equipment.
- UN 3480 — Lithium-ion batteries, shipped by themselves. Rechargeable lithium-ion and lithium-polymer cells — the type in laptops, most portable lab instruments, drones, and UPS battery packs — fall here.
- UN 3481 — Lithium-ion batteries packed with, or contained in, equipment.
This distinction is not academic paperwork: it determines which packing instruction applies, and lithium metal batteries (UN 3090/3091) are subject to materially stricter handling than lithium-ion. A lab shipping a battery-powered field sensor should identify both the chemistry and the packing configuration before choosing a packing instruction.
Section II and fully regulated: how the tier is set
Within each UN number, the applicable packing instruction is tiered by the battery’s watt-hour rating (Wh, for lithium-ion) or lithium content in grams (for lithium metal), plus the quantity per package:
- Watt-hour rating is calculated as nominal voltage (V) × rated capacity (Ah). This number is required on the battery or its packaging; if it is not marked, it has to be calculated and documented before the battery can be classified.
- Small cells/batteries under the relevant threshold, that have also passed the UN 38.3 test series (see below), generally qualify for the reduced-requirement tier commonly referred to as ‘Section II’ — a specific lithium battery handling mark, a maximum number of packages per consignment, and limited documentation, but not a full Class 9 shipper’s declaration or hazard diamond for air shipment.
- Batteries above the small-cell threshold, or shipped in quantities above the Section II limits, are fully regulated: full UN-specification packaging, the Class 9 hazard label, a complete Shipper’s Declaration for Dangerous Goods (for air), and a shipper who has completed the applicable dangerous goods training (see below).
The exact Wh and gram thresholds, and the exact package-count limits, are set out in the current IATA DGR packing instructions (PI 965–970 cover lithium batteries specifically, with lettered sections for standalone-cell, standalone-battery, and equipment-packed/contained variants) and in 49 CFR §172.102 Special Provisions for ground shipment. Because these figures are exactly the kind of detail that shifts between DGR editions, confirm the current numbers directly against the DGR or your carrier’s lithium battery guidance rather than a cached figure — do not classify a shipment from memory of a prior year’s thresholds.
UN 38.3 testing: the prerequisite for any reduced-requirement shipment
Before any lithium cell or battery design can be shipped under the reduced Section II provisions — or, in most cases, shipped at all — it must pass the UN 38.3 test series, defined in the UN Manual of Tests and Criteria, Part III, subsection 38.3. The series covers altitude simulation, thermal cycling, vibration, mechanical shock, external short circuit, impact/crush, overcharge, and forced discharge. This testing is a design-level requirement performed (and documented) by the manufacturer, not something a lab performs itself — but a lab shipping an instrument with an embedded or spare lithium battery should be able to confirm, from the manufacturer’s documentation, that the specific battery model has passed UN 38.3. If that documentation cannot be produced, the battery cannot legally be shipped as a lithium battery under these reduced provisions.
Restrictions on passenger aircraft
Following a series of ICAO and IATA rule changes, lithium metal batteries (UN 3090/3091) shipped as cargo, and standalone lithium-ion batteries not packed with or contained in equipment (UN 3480), are forbidden for transport as cargo on passenger aircraft and must move on cargo-only aircraft. Lithium-ion batteries packed with or contained in equipment (UN 3481) can generally still move on passenger aircraft, subject to quantity limits and Section II/fully-regulated packing requirements. Labs that need to overnight a spare battery pack separately from the instrument it belongs to should confirm with their carrier whether that specific shipment is eligible for passenger-aircraft routing at all — it often is not, which affects transit time as much as it affects compliance.
Carriers also commonly require lithium-ion cells and batteries shipped standalone (not installed in equipment) as cargo to be shipped at a reduced state of charge, rather than fully charged, to reduce the energy available in a thermal event. Confirm your carrier’s current state-of-charge requirement before shipping standalone cells or batteries — this is one of the more frequently revised provisions and is enforced inconsistently by DGR edition and carrier.
What this looks like for a typical lab shipment
Most lab lithium battery shipments fall into one of three scenarios:
- Sending an instrument for repair or calibration with its battery installed. This is UN 3481 or UN 3091 depending on chemistry. If the installed battery is at or below the applicable Section II threshold, mark the package with the lithium battery handling label and ship under Section II. Above that threshold, it is fully regulated.
- Sending a spare or replacement battery pack separately from the instrument. This is UN 3480 or UN 3090 (standalone), which carries stricter passenger-aircraft restrictions and, for lithium metal, a lower reduced-provision threshold. Confirm cargo-only routing is available before promising a delivery date.
- Disposing of or recycling a depleted or damaged battery. Damaged, defective, or recalled lithium batteries are subject to separate, stricter special provisions and in many cases cannot be shipped by common carrier at all — they require a permitted hazardous waste transporter. Treat a swollen, punctured, or heat-damaged battery as a waste stream question first, a shipping question second; route it through the lab’s chemical/hazardous waste disposal process rather than defaulting to standard parcel shipment.
Documentation and training
Fully regulated shipments require a person who has completed dangerous goods training appropriate to their role to prepare the shipment: classify the battery, select the correct packing instruction, complete the Shipper’s Declaration for Dangerous Goods (air) or shipping papers (ground), and apply the correct marks and labels. In the US, PHMSA requires hazmat employee training under 49 CFR Subpart H, generally renewed every three years; IATA requires initial and recurrent (typically 24-month) training for anyone who offers dangerous goods for air transport. Even Section II shipments, which do not require a full shipper’s declaration, still require the person preparing the shipment to understand the classification and marking requirements — reduced documentation is not the same as no training required.
Frequently asked questions
Do I need a special label just to ship an instrument with a built-in lithium battery?
If the battery’s watt-hour rating (lithium-ion) or lithium content (lithium metal) is at or below the applicable Section II threshold and the battery model has passed UN 38.3 testing, the package needs the lithium battery handling mark, not a full Class 9 hazard diamond. Above that threshold, or above the Section II quantity limit per package, the full Class 9 marking, labeling, and shipper’s declaration apply.
Can I ship a spare lithium battery in checked luggage or as a passenger?
Passenger carriage of spare lithium batteries is governed by separate, generally more permissive rules for personal electronics than commercial cargo shipment is, and is set by the airline and by security regulations, not by the DGR packing instructions in this guide. This page addresses shipping batteries as cargo/freight through a carrier, not carrying them as a passenger.
What UN number applies to the lithium-ion battery pack in a portable field instrument?
If the battery is installed in or packed alongside the instrument, it is UN 3481. If you are shipping a replacement battery pack on its own, separate from the instrument, it is UN 3480.
Is a damaged or swollen lithium battery ever safe to ship by standard parcel service?
No. Damaged, defective, or recalled lithium cells and batteries are subject to more restrictive special provisions than intact batteries and, in most cases, cannot move through a standard small-parcel network at all. Route them through your institution’s hazardous waste or EH&S process instead.
Does the same battery need to be reclassified for ground versus air shipment?
The underlying UN number and hazard class stay the same, but the specific packing instruction, marking, and documentation requirements differ by mode — 49 CFR governs ground shipment in the US, the IATA DGR governs air, and the IMDG Code governs sea. A shipment correctly prepared for one mode is not automatically compliant for another; confirm the mode-specific requirements each time the transport method changes.
Related CASRAI guides
For the broader dangerous-goods framework these packing instructions sit inside, see IATA Dangerous Goods Regulations: A Lab Shipper’s Guide. For who in the lab needs to be trained to prepare any of these shipments, see Hazmat Shipping Training and Certification Requirements for Lab Staff. For the disposal-side question when a battery is damaged or end-of-life, see Lab Waste Disposal: RCRA Streams, Generator Status, and Disposal Routes. For other dangerous-goods shipment types labs regularly encounter, see Cold-Chain Shipping Requirements for Biological Reagents and Shipping Biological Substances by Air: Category A vs. Category B.
