What You Need in Place First
If your label says lithium‑ion, your paperwork needs to say UN3480 or UN3481. That’s the hinge. Everything else follows from that call.
Set up three things before you touch a box:
- Evidence that the battery design passed UN 38.3 (the test report) and a UN38.3 test summary you can hand to a carrier or inspector on demand.
- A packaging bill of materials that actually fits the cell or pack you ship today, not last year’s revision.
- A carrier that will accept your mode and quantity. Many integrators require pre‑approval for UN3480 by air. Call the dangerous goods desk, note the person’s name, and log the conditions.
Print your current SDS. Put a digital copy of the UN38.3 test summary on a shared drive. Then tape a QR code linking to it on your pack list. You want the ramp agent to scan, nod, and move the pallet.Tools on the bench:
- Calibrated scale. Press tare before each package.
- Tape gun and 3-inch pressure‑sensitive tape. Pull and press with your palm; no loose edges.
- Multimeter. Spot‑check voltage as part of state‑of‑charge (SOC) control.
- Corner protectors, anti‑static bags, non‑conductive caps, and zip ties.
- A label kit: lithium battery mark, Class 9 lithium battery label, Cargo Aircraft Only label, orientation arrows, OVERPACK mark, and a phone number label that someone actually answers.
A note on “UN38.3 certification.” There isn’t a government certificate. There is only compliance: the cell/battery design must have passed UN Manual of Tests and Criteria, Part III, sub‑section 38.3, and you must provide a UN38.3 test summary upon request. Labs issue reports. You keep them and share the summary.The U.S. Workflow, Step by Step
- Classify the shipment
Open the spec sheet and write down chemistry (Li‑ion vs Li‑metal), rated Wh, and configuration (cell, battery, or equipment). Choose the proper shipping name and UN number:
- UN3480, Lithium ion batteries (including lithium ion polymer) — standalone.
- UN3481, Lithium ion batteries contained in equipment — installed in the device.
- UN3481, Lithium ion batteries packed with equipment — in the same box but not installed.
For aircraft, match your shipment to IATA packing instructions (PI 965–967). For domestic ground, use 49 CFR 173.185. For ocean, use the IMDG Code.
- Confirm UN38.3 compliance and compile the test summary
Ask your cell or pack supplier for the UN test report and a UN38.3 test summary. Verify that the summary names:
- Manufacturer and contact
- Cell/battery model and description
- Test standard reference and edition
- Each test T.1 through T.8 and result
- Report date and responsible person
Open the PDF. Check the model number character by character against your nameplate. If your pack revision changed BMS, cell type, or mechanical design, pause and confirm whether a new test is needed under the “type” definition in 38.3. Make the email thread part of your file.
- Measure and control watt‑hours and SOC
Watt‑hours must be marked on the battery. If it’s missing, calculate Wh = nominal voltage × rated Ah and print a durable label. For air shipments of UN3480, set SOC at or below 30% per IATA lithium battery shipping rules for 2026. Use your BMS tool or a controlled discharge. Don’t guess. Put the meter on the terminals and record the reading on your traveler. - Choose the mode based on risk and cost
- Air: fastest, most restrictive. UN3480 is cargo aircraft only with quantity limits, full Class 9 lithium battery labeling, and shipper’s declaration. Many carriers limit daily pieces or require contracts.
- Ground (49 CFR lithium battery ground shipping): more flexible. Small batteries meeting 173.185(c) can move with the lithium battery mark and without hazard class labels; larger packs are fully regulated. Carrier rules still apply.
- Ocean: good for heavy ESS and industrial packs. Follow IMDG stowage and segregation. Book early; DG slots fill.
- Build the package
Do the physical work:
- Cap or tape terminals. No exposed metal. No way to short.
- Wrap each battery in a non‑conductive bag. Add cushioning so it cannot move inside the inner packaging.
- Use a sturdy outer. Fully regulated shipments need UN performance packaging (e.g., 4G fiberboard, 4C1 wood) sized to your inner pack. Close it as tested: correct tape pattern, number of wraps, closure method. Don’t improvise.
- Shake the packed box. If you hear movement, repack.
- Apply marks and labels in the right combination
Stand the box up on the scale. Write the gross weight on your shipper’s declaration if required. Then label:
- Lithium battery mark with UN number (UN3480 or UN3481) and a working phone number for more information.
- Class 9 lithium battery hazard label (the one with the battery icon) when fully regulated.
- Cargo Aircraft Only label for UN3480 air shipments that cannot go on passenger aircraft.
- Proper Shipping Name and UN number printed near the Class 9 label.
- Orientation arrows on fiberboard boxes containing liquids or when your packaging standard requires them.
- OVERPACK mark if you wrap or band multiple labeled boxes together; replicate required labels so at least one set is visible.
Press each label flat with your palm. No wrinkles over edges. No labels covering others.
- Prepare paperwork
- Air: IATA Shipper’s Declaration for Dangerous Goods for fully regulated shipments. Use the current edition. Fill quantity, net battery weight, packing instruction, and any special provisions. Attach SDS and the commercial invoice. Keep copies.
- Ground: Shipping papers per 49 CFR if fully regulated; include the proper shipping description and a 24‑hour emergency response number. If your shipment qualifies for the small battery exceptions in 173.185(c), you’ll apply the lithium battery mark and follow packaging rules; some carriers still ask for DG documentation—check your service guide.
- Ocean: IMDG dangerous goods declaration (DGD), packing certificate, and segregation plan if required.
- Overpack and palletize
Place labeled boxes on a clean pallet. Use corner boards. Stretch‑wrap tightly with at least three bottom wraps and three top wraps. If you cover labels, add a duplicate set on the outside of the stretch wrap or apply the OVERPACK mark. - Book and pre‑alert
Upload paperwork to the carrier portal. Include the UN38.3 test summary link if allowed. Email the acceptance checklist to your forwarder. Write “SOC ≤ 30%” in the booking notes for UN3480 by air to speed acceptance. - Handoff and retain records
At tender, hand the DG packet to the agent. Keep training records, declarations, and acceptance checklists for at least two years, or longer if your quality system requires.Mode Rules that Matter
Air (IATA DGR; ICAO TI governs)
- UN3480 is restricted to cargo aircraft, with package quantity limits and full Class 9 lithium battery hazard communication. SOC must be at or below 30%. Shipper’s Declaration is required.
- UN3481 shipments (contained in or packed with equipment) have different limits and documentation triggers. Check PI 966/967 for piece counts and inner packaging. Many consumer moves are possible but still need the lithium battery mark and sometimes the declaration, depending on configuration and quantity.
- Damaged, defective, or recalled lithium batteries are not accepted by air. Treat them as hazardous waste or non‑air modes under applicable approvals.
Ground (49 CFR) - 49 CFR 173.185 is your home base. Many small lithium‑ion shipments qualify for exceptions: strong outer packaging, lithium battery mark, and no Class 9 label or shipping paper. Larger packs and many industrial batteries are fully regulated Class 9.
- You need hazmat training under 49 CFR Subpart H if you offer fully regulated packages. Keep training certificates on file.
- Carriers (parcel and LTL) layer their own acceptance rules. Read the tariff. Call before you ship unusual sizes.
Ocean (IMDG Code) - Similar technical requirements to air/ground but with maritime stowage, segregation, and documentation.
- Very large containerized energy storage units may fall under UN 3536 (lithium batteries installed in cargo transport unit). Do not assume. Confirm the entry and packing instructions with your DG forwarder.
Technical Details That Trip Teams Up
UN38.3 “type” and design changes
- Swapping cell suppliers, changing the BMS, altering the enclosure, or adding parallel strings can push you into a new “type.” Ask your lab or safety engineer to decide whether a partial or full retest is needed. Put that decision in writing.
“Contained in” versus “packed with” - If the battery is installed in the equipment and connected, that’s “contained in equipment.” If it sits in the same box but is not installed, that’s “packed with equipment.” The limits and labels differ. Mixing them casually causes holds.
Small battery myths - Air “Section II” allowances for standalone UN3480 were removed years ago. Don’t rely on an old carve‑out from a forum post. Read the current IATA packing instruction.
SOC proof - A control plan beats an argument at the counter. Export a BMS report showing SOC. When that’s not possible, maintain a discharge‑to‑setpoint log signed by the operator. Clip the log to the pick list.
Watt‑hour marking - The battery itself must show watt‑hours. If your supplier left it off, you add a durable, legible label. Not the box—the battery.
Damaged or recalled batteries - Treat them as a different hazard class scenario with mode prohibitions. If a battery leaked, vented, or shows swelling, stop. Isolate the unit, take photos, and escalate to your EHS lead.
Troubleshooting: Why Carriers Put You on Hold
What goes wrong in the real world, and how to fix it fast:
- Missing or mismatched UN numbers on the lithium battery mark. Fix: print a new mark with UN3480 or UN3481 that matches your declaration.
- No phone number or a number that rings to nowhere. Fix: route to a trained person; test the line before pickup.
- SOC not controlled for UN3480 by air. Fix: discharge to ≤30%, update the note in your booking, re‑present.
- Reused UN box with the wrong closure. Fix: follow the closure instructions from the box’s test report—tape width, pattern, staples—and document it.
- Labels hidden by stretch wrap. Fix: apply duplicate labels to the outside of the wrap or use OVERPACK with replicated labels.
- UN38.3 test summary not available. Fix: email a PDF or provide a QR code immediately. Keep it in the shipment folder going forward.
- Mixing UN3480 and general cargo in the same overpack without marks. Fix: break down the overpack or add proper marks and replicated labels.
When a hold happens, don’t argue on the dock. Take the box back, rework on the bench, photograph each fix, and resubmit with a bullet list of corrections in your email to the DG desk.Worked Examples for LiFePO4 Packs
Example A — 10 kWh LiFePO4 residential ESS pack, domestic U.S.
- Classification: Li‑ion chemistry, UN3480, Lithium ion batteries. Watt‑hours far above small‑battery exceptions.
- Mode choice: air is technically possible only under very tight limits and carrier acceptance; cost and risk are high. Most teams choose ground (49 CFR) or ocean.
- Actions on the bench: discharge to shipping setpoint; cap the terminals; bag and cushion; build a UN 4G outer with blocking and bracing.
- Marks/labels: lithium battery mark (UN3480), Class 9 lithium battery label, proper shipping name and UN number. For ground, apply as fully regulated if above exception thresholds.
- Docs: shipping papers per 49 CFR with emergency number; SDS attached. Keep UN38.3 test summary ready.
- Pallet: corner boards, four straps, stretch‑wrap, OVERPACK mark with replicated labels.
- Risk control: request non‑stack handling from the carrier; photograph the loaded pallet.
Example B — 48 V, 400 Ah LiFePO4 forklift replacement battery (industrial truck) - Classification: UN3480 unless shipped installed in the truck. If the battery is shipped inside the powered industrial truck, 49 CFR has a vehicle rule—confirm applicability. As a standalone pack, treat as fully regulated Class 9.
- Mode: ground or ocean.
- Actions: verify UN38.3 type coverage for the exact BMS and cell set; torque terminal covers; add shock indicators on the crate; weigh and record gross weight on the bill.
- Marks/labels: lithium battery mark (UN3480), Class 9 lithium battery label, proper shipping name, UN number.
- Docs: shipping paper with net battery weight; emergency response number that connects to someone who can read the SDS.
- Note: lift‑truck batteries are heavy. Screw the crate to the pallet deck. No loose nails. No tilt.
Example C — 12 V, 100 Ah LiFePO4 RV/golf‑cart pack to a dealer - Classification: Standalone replacement pack is UN3480. If it ships installed in the RV or golf cart, different equipment/vehicle provisions may apply—confirm before you rely on them.
- Mode: many dealers prefer ground. Air is possible subject to carrier acceptance, SOC ≤30%, and IATA limits; some integrators will not accept it from non‑contract shippers.
- Actions: fit non‑conductive end caps; foam‑in‑place to stop movement; verify watt‑hour marking on the battery case; print the lithium battery mark with UN3480.
- Labels/documents: for air, add Class 9 lithium battery label, Cargo Aircraft Only if required, and Shipper’s Declaration citing the correct packing instruction. For ground, follow 49 CFR; use the exception only if the configuration qualifies.
- Tip: put a copy of the UN38.3 test summary in the box sleeve. The dealer will thank you when forwarding to an end customer.
These examples mirror what many OEM/ODM makers of LiFePO4 packs for energy storage, forklifts, RVs, and golf carts ship every week. The pattern does not change: classify, prove UN38.3, control SOC, package, mark, declare, and book with a carrier that actually wants the freight.Documentation and Labeling, Up Close
UN38.3 test summary essentials
Print or export a one‑page summary with: - Manufacturer, address, and contact
- Cell/battery model designation and description
- Reference to UN Manual of Tests and Criteria, Part III, sub‑section 38.3 (edition specified)
- Individual test outcomes (T.1–T.8)
- Report date and signatory
Store the full lab report in controlled documents. The summary travels; the report stays internal but must be available.
Shipper’s Declaration (air) - Use the current IATA format. Black ink. No corrections with white‑out.
- Enter the proper shipping name and UN number exactly as listed.
- Indicate packing instruction (PI 965/966/967 for lithium ion).
- Weigh the net battery content; don’t estimate. Put the box on the scale and read the number.
- Sign by a trained person. Training currency must be documented.
Lithium battery mark - Minimum size and border thickness matter. If the box is small, use the reduced‑size mark allowed by the rule.
- Include UN number and a telephone number that reaches knowledgeable staff. Test the line.
Carrier Acceptance: Winning the Ramp
Do three things the day before pickup:
- Email the forwarder a clean photo set: one shot of each label, one of the closed box, and one of the pallet.
- Attach the SDS, Shipper’s Declaration (if required), and a link to the UN38.3 test summary.
- Put your cell phone on. If the acceptance team calls, answer on the first ring.
At pickup, hand the packet to the driver or counter agent. Say “Class 9 lithium battery, UN3480/UN3481” out loud. People listen when they hear a hazard class.Quality Metrics and Cost Control
Track these on a whiteboard near the bench:
- Acceptance rate (no‑defect DG acceptance on first presentation)
- Rework count and causes (label, SOC, packaging, paperwork)
- Damage rate in transit
- Average door‑to‑door time by mode
- Packaging cost per shipped Wh
Run a monthly 15‑minute audit: - Pull three shipments at random. Open the photos and paperwork. Check for UN number mismatches, missing SOC notes, and unreadable labels.
- Read the latest regulatory bulletins from your carriers and from IATA/PHMSA/IMDG. Flag any changes to PI 965–967 or 49 CFR 173.185 for your work instructions.
- Refresh training for anyone who signs a declaration.
One hold at an airport can burn more money than a month of proper packaging. Acceptance is ROI.Common Edge Cases
- Prototypes and small production runs: If the design has not passed UN38.3, you need a competent authority approval to move by air. Most teams choose ground with special handling or wait for testing.
- Mixed chemistries in one box: Don’t. Separate shipments.
- Power banks and portable power stations: These are lithium‑ion batteries by another name. Treat them under UN3480 unless shipped “contained in equipment” per the relevant instruction.
- Containerized ESS: Ask your DG forwarder about UN 3536 versus UN3480 at the system level. The entry drives stowage, labeling, and paperwork.
- Returns and field failures: Create an RMA flow that assumes “damaged/defective” and routes to ground‑only carriers with special packaging.
A Bench‑Side Checklist You Can Use Today
Tape this where you work. Then follow it like a pilot.
- Identify: UN3480 or UN3481? Write it on the traveler.
- Verify: UN38.3 test summary matches model and revision. File link checked.
- Mark battery: Watt‑hours printed on the case. If missing, add a durable label.
- Control SOC: For UN3480 by air, discharge to ≤30%. Log the reading.
- Protect: Cap/tape terminals, bag, cushion. No movement.
- Pack: Use the specified inner and UN outer. Close exactly as tested.
- Label box: Lithium battery mark with UN number and phone; Class 9 lithium battery label if required; CAO label if required; proper shipping name and UN number; OVERPACK if used.
- Paper: SDS, shipper’s declaration or shipping paper as applicable, emergency number confirmed.
- Photo: Snap labels and pallet. Save to the job folder.
- Book: Pre‑alert carrier with docs and photos.
- Retain: Archive records and training certs.
Sources and Update Cadence
Work to the current editions:
- UN Manual of Tests and Criteria, Part III, sub‑section 38.3
- IATA Dangerous Goods Regulations (the current 2026 edition for air)
- 49 CFR Parts 171–180, especially 173.185 for lithium batteries (ground)
- IMDG Code for ocean shipments
- Individual carrier service guides and dangerous goods tariffs
Put a recurring calendar entry at the turn of each year to review IATA changes and mid‑year to check PHMSA and carrier updates. Then change your work instructions, not just the slide deck.
Move carefully, label cleanly, and keep your test summary within arm’s reach. That’s how UN38.3‑certified lithium battery shipping guidelines turn into shipments that load, fly, and arrive.