Why carriers reject lithium battery shipments

A single misdeclared lithium battery can stop a shipment, trigger a carrier refusal, or lead to costly regulatory fines. According to PHMSA's Lithium Battery Guide, carriers and regulators most often cite misclassification, wrong or non‑UN packaging, and missing marks or labels.

This post gives a concise, audit‑proof documentation and pre‑shipment QC checklist for air, ocean, and ground shipments. Use it to catch problems before tendering and to build the audit evidence auditors expect.

• Required documents and test summaries.
• Correct marks and labels, including Cargo Aircraft Only and handling marks where applicable.
• Approved packaging and short‑circuit protection.
• Pre‑tender QC checks: visual inspections, State of Charge verification, and seal integrity.
• Training records and role‑based responsibilities.
• Audit evidence and CAPA documentation to prove fixes and prevent recurrence.

Later sections translate these points into a compact, actionable checklist you can implement today.

Document checklist you must have before tendering

Worried a missing paper will stop your shipment at tender? A short stack of documents proves compliance and keeps carriers from refusing your load.

Always have these core documents ready and retrievable on demand: a UN 38.3 test summary, a Safety Data Sheet (SDS), shipping papers or a Shipper's Declaration when required, and emergency response contact information.

Mode-by-mode minimum documents

• Air: For fully regulated air shipments provide a Shipper's Declaration for Dangerous Goods (DGD), show "Dangerous goods as per attached DGD" on the Air Waybill, include a 24-hour emergency contact, and ensure the shipper's signature and date appear on the DGD.
• Ocean: Include a Dangerous Goods declaration or clear Bill of Lading language with UN number, proper shipping name, Class 9 designation, package count and net quantity, plus emergency contact information.
• Ground (49 CFR): Provide shipping papers with the UN number, proper shipping name, hazard class, quantity, package count, and a 24-hour emergency telephone number, or show any applicable exception notation such as transport under § 173.185(e).

What to record on papers and on the package

Minimum fields on every declaration or shipping paper are the UN number, proper shipping name, hazard class, quantity, package type and count, and a 24‑hour emergency contact.

For air shipments the DGD must also bear the shipper's certification signature and date. Research and IATA guidance require that statement for fully regulated air consignments.

Record Watt‑hour (Wh) ratings on the outside case as required since May 10, 2024, and be able to declare compliance with applicable State of Charge (SoC) limits for air shipments.

Reconciling multi‑modal handoffs

• Use the same UN numbers and proper shipping names across all documents so every handler reads the same risk ID.
• Ensure the AWB and Bill of Lading reflect the DGD or dangerous goods declaration language to prevent conflicts at handoffs.
• When mode rules diverge, document the choice to meet the most stringent applicable requirement and keep the test summary and declarations together for audit requests.

Keep searchable copies of test summaries, DGDs, AWBs/Bills of Lading, SDS, and SoC/Wh records so you can produce them on request. For a simple filing template and retention pointers, see our guide on building an audit‑ready training and compliance file.

Catch label and packaging errors before tender

Ever had a carrier refuse a pallet for a missing label or wrong box? That single miss can stop the load and trigger fines.

Use this concise QC checklist to verify outer and inner packaging, required tests, and exact mark and label placement before you tender.

Outer packaging and structural checks

• Confirm UN certification or equivalent performance for fully regulated batteries. The outer box must survive a 1.2 meter drop without damage.
• For air shipments, verify the package meets relevant IATA packing instructions and, when required, the 3 meter stacking/static load test.
• Ensure strong outer packaging for large batteries. Crates or pallet banding may be acceptable for surface and ocean modes.
• If using an overpack, mark it with the word OVERPACK, the UN number, and all hazard class labels when inner markings are not visible.
• Record Watt‑hour (Wh) ratings on the outer case where required, and keep the UN 38.3 test summary available for audit.

Inner packaging and electrical safety checks

• Protect each cell or battery against short circuits using non‑conductive barriers or individual plastic bags.
• Insulate and protect terminals with non‑conductive caps, tape, or covers so contacts cannot touch conductive material.
• Use cushioning to prevent movement and crushing. For damaged or defective batteries use non‑combustible, non‑conductive absorbent cushioning.
• Segregate batteries from incompatible hazardous materials when packing under air packing instructions that prohibit mixed contents.

Marking and label placement — consolidated pre‑tender checks

• Place all labels and marks on a visible surface. Do not put required marks on the bottom of the package.
• Apply the new lithium battery mark for excepted shipments. Make it at least 100 mm by 100 mm and include the applicable UN number.
• Use the Class 9 hazard label and the modified lithium battery Class 9 where required. Keep labels near the proper shipping name.
• If shipment is cargo aircraft only, affix the CAO label on the same surface as the hazard label and keep it unobscured.
• Check for common errors: overlapping labels, labels folded over seams, missing UN numbers, and conflicting AWB/BOL declaration language.
• Photograph each package side with visible labels and marks. Save photos with the DGD and UN 38.3 summary for audit evidence.

For detailed guidance on marks and SoC/Wh requirements, consult PHMSA's Lithium Battery Guide. For air packaging performance rules see IATA's 3 m stacking guidance.

Audit‑Ready Pre‑Tender QC Workflow and Records

Want to stop carrier refusals and fines before they start? A tight, repeatable QC workflow catches the common lithium battery mistakes that trigger rejections.

Below is a compact, repeatable sample inspection process and the exact records to keep for each shipment so you can prove compliance at tender or in an audit.

Step‑by‑step sample inspection workflow

• Visually inspect each sampled package for dents, bulges, leaks, crushed corners, missing labels, or damaged seals and photograph every defect.
• Verify State of Charge (SoC) where required and record the measurement method, device used, inspector name, and readings; for air, document SoC at or below 30% when applicable.
• Sample tape and seal integrity on a statistically representative lot; record seal IDs, pass/fail results, and any vacuum or bubble test notes.
• Confirm inner/outer packaging meets the applicable packing instruction and UN performance criteria and record the box type, UN number, and Wh rating stamped on the case.
• Cross‑check shipment documents against physical goods: attach UN 38.3 summary, SDS, Shipper's Declaration or DGD when required, AWB/BOL, and packing list to the QC record.

Records to capture for every tender

• Photographs of each package face showing labels, marks, and any damage.
• Completed QC checklist with inspector name, date, sampled carton IDs, and pass/fail notes.
• SoC log showing method, device, readings, and source of SoC data if provided by the manufacturer.
• Seal/tape test records including sample size, test method, and serial or batch numbers.
• Copies of UN 38.3 summary, SDS, DGD or shipper's declaration, AWB/BOL, and packing list stored together and searchable.
• Relevant training records tied to the shipment team, showing training dates and the materials used.

Tender checks, record retention, and audit responses

Expect carriers at tender to verify documents, inspect packaging and labels, and to open or screen contents if anything looks off.

Keep shipping papers for two years after initial carrier acceptance, and retain dangerous goods records per national rules when longer retention applies.

If a nonconformance occurs, prepare a CAPA package with a clear problem statement, root‑cause analysis, management sign‑off, an action plan, implementation evidence, verification results, and updated training records.

We recommend keeping these records searchable and linking training evidence to shipments using an audit‑ready training matrix.

For details on SoC and other lithium battery rules consult PHMSA's Lithium Battery Guide and for air rules see IATA DGR.

If you need a template for linking training to shipments, see our guide on building an audit‑ready hazmat training matrix.

See our training matrix guide here: Developing an audit-ready hazmat training matrix.

Make the checklist part of your SOPs and audits

Want shipments that rarely get stopped at tender?

Start with four basics. First, complete and reconciled paperwork for every mode. Second, packaging and marks that meet mode‑specific rules. Third, a repeatable pre‑tender QC workflow with photos and SoC checks. Fourth, retained training and audit records linked to each shipment.

Turn this checklist into written SOPs, assign owners, and run regular internal audits to show due diligence.

For multimodal moves, reconcile UN numbers, shipping names, marks, and declarations and follow the most restrictive rule.

Map QC tasks to job roles and tie training records to shipments so audit responses are quick and complete. See our guide on role mapping for a simple template and examples: how to map job roles to mandatory 49 CFR training requirements.

Need help turning this checklist into SOPs or scheduling a compliance audit? TMGI builds SOPs, trains teams, and conducts hazmat audits to reduce rejections and fines. Call our Strongsville office at (866) 572-8644 or email twagner@tmgihazmat.com.

Do this consistently and auditors will see a clear trail of controls, ownership, and corrective actions when issues arise.