21700 Battery Export: Complete Certification and Logistics Workflow

Blog | Published by Alex on August 12, 2026

Comprehensive Compliance and Shipping Procedure for 21700 Lithium-Ion Cells (UN3480) – A Full Technical Guide

1. Mandatory Transportation Safety Test: UN38.3 Certification

UN38.3 is the core safety standard specified in Section 38.3 of the United Nations Manual of Tests and Criteria for the transport of lithium batteries. This certification is strictly mandatory for all air, sea, and land transport of 21700 batteries, and has been fully adopted by the International Civil Aviation Organization (ICAO), the International Air Transport Association (IATA), and the International Maritime Organization (IMDG). Carriers will refuse shipments without a valid UN38.3 test summary. This certification must be conducted by a third-party laboratory accredited with ISO/IEC 17025 (e.g., CVC, TÜV, SGS). The testing period is approximately 5 to 7 working days. If a sample fails a test (e.g., leakage during drop test, bulging under high temperature), the lab provides a rectification plan (e.g., thickening the cell shell, adjusting packaging cushions). The test must be passed in sequence. The following 8 core tests simulate extreme environments encountered during cross-border logistics:

Special Additional Test

If a single package contains more than 24 cells, a 1.2-meter free drop test of the complete package is required to verify packaging integrity.

Validity Notice

The UN38.3 test summary does not have a fixed expiration date. However, if the cell design, materials, or manufacturing process undergo significant changes (e.g., cathode material change, electrolyte formulation change), a partial or full retest is required.

2. Essential Shipping Documentation: MSDS and Transport Classification

After passing UN38.3, the following documents are required for carrier review and customs clearance:

2.1 Material Safety Data Sheet (MSDS)

An MSDS provides detailed information on the chemical composition, hazard classification, leakage emergency measures, and firefighting advice for the cells.
Requirement: Must be in English (or the official language of the destination country).
Standard: Must comply with the Globally Harmonized System (GHS) of classification and labeling.
Content: Sections 1-16, including Section 14 (Transport Information) specifying UN3480, Class 9, and packing group.

2.2 Transport Classification Certificate

This certificate is issued by authorized institutions (e.g., Shanghai Institute of Chemical Industry, DGM). It certifies that the specific batch of goods can be transported as Class 9 dangerous goods.
Critical Notice: Separate certificates are required for Air and Sea transport.
Validity: Typically valid until December 31st of the current year (Annual renewal required).

3. Packaging Compliance: Dangerous Goods Packaging Certificate

For 21700 cells (single cell energy rating > 20Wh), the packaging must be certified for dangerous goods according to the UN Model Regulations, IMDG Code, and IATA DGR.

3.1 Overview of the Packaging System

The packaging structure typically consists of three layers:
1. Inner Layer: Individual bubble wrap or polyimide tape covering the exposed positive/negative terminals (to prevent short circuits).
2. Intermediate Layer: Honeycomb paper grids or ESD-suction trays to fix cells in place, preventing shifting.
3. Outer Layer: Strong corrugated carton boxes meeting the II Performance Level.

3.2 Certification Application Process (Two Steps)

Step 1: Packaging Performance Test Report
Applicant: The packaging manufacturer.
Authority: Local Customs/Inspection Agency.
Content: Proves the strength, sealing, and durability of the empty box/crate.
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Step 2: Use of Packaging Appraisal (The "Wei Bao Zheng")
Applicant: The cell manufacturer (exporter).
Authority: Local Customs authority at the place of production.
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Required Materials:
- Application form for packaging inspection.
- Packaging performance test report (from Step 1).
- Factory self-inspection conformity certificate.
- Dangerous goods classification report.
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On-site Inspection focuses on:
1. UN Packaging Marking: Correct, durable, and legible UN codes on the package.
2. Anti-Short Circuit Measures: Terminals are insulated; stacked packages do not squeeze cells.
3. Separation Materials: Non-conductive dividers between cells to prevent contact.
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Validity:
- Air: 3 months.
- Sea/Land: 1 year.
- Note: The certificate is valid for a single shipment only (one batch, one use) and cannot be shared across different batches without re-inspection.

4. Destination Market Safety Approvals

Beyond transportation compliance, the cells must meet the destination country's safety standards for customs clearance and market sale.

4.1 CB Certification (Global Foundation)

Standard: IEC 62133 (Secondary cells and batteries containing alkaline or other non-acid electrolytes).
Value: "One test, multiple approvals." Under the IECEE framework, a CB certificate covers over 50 countries.
Strategy: Obtaining CB certification allows entry into EU (CE), US (UL), and Japan (PSE) by only paying for minor national difference tests, saving significant time and cost.
Key Note: Must select a lab recognized by the IECEE. Otherwise, the report may be rejected by the destination country.

4.2 European Market (EU)

- CE Marking: (LVD Directive 2014/35/EU + EMC Directive 2014/30/EU).
- EN Standard: EN 62133 (Cell safety).
- New Battery Regulation (EU 2023/1542): Requires carbon footprint declaration, recycled material content, and digital battery passport (starting 2027).
- RoHS: Directive 2011/65/EU (Restriction of Hazardous Substances).
- REACH: Regulation (EC) No 1907/2006 (SVHC notification).

4.3 US Market

- UL 1642: Standard for Lithium Batteries (Cell level safety).
- UL 21700: Specific standard framework for this form factor (increasingly required by buyers).
- FCC: Part 15 for cells with smart monitoring/BMS features.
- 49 CFR: US Transport regulations (overlaps with UN requirements).

4.4 Other Major Markets

- Japan: PSE (JIS C 8712).
- Korea: KC Certification.
- Southeast Asia: TISI (Thailand), QCVN (Vietnam).
- Middle East: SASO (Saudi Arabia).

5. Pre-Shipment Execution: SOC and Declaration

5.1 State of Charge (SOC) Control

Regulation: Effective January 1, 2026, ICAO/IATA requires that all lithium batteries transported by air must have a State of Charge (SOC) not exceeding 30%.
Reason: To minimize the energy available for thermal runaway, significantly reducing fire risk in the cargo hold.
Evidence: A mandatory "Lithium Battery SOC Declaration Letter" must be issued and signed by the shipper.

5.2 Dangerous Goods Declaration

A licensed freight forwarder or carrier must submit the declaration electronically.
Shipping Accuracy: Correct identification on the Air Waybill / Bill of Lading.
- UN Number: UN3480.
- Proper Shipping Name: "Lithium Ion Batteries" (or "Lithium ion batteries").
- Hazard Class: 9.
- Packing Group: II.
Required Annexes: UN38.3 Test Summary, MSDS, and a copy of the Dangerous Goods Packaging Certificate.
Legal Warning: Misdeclaration (e.g., omitting UN3480) can result in massive fines (up to $100,000+ in some jurisdictions), confiscation of goods, and criminal liability.

5.3 Package Marking and Labeling

The outer packaging must display the following:
1. Class 9 Hazard Label: Diamond shape with black and white stripes.
2. Lithium Battery Handling Label: Showing the UN number and a cautionary phone number.
3. "Cargo Aircraft Only" (CAO): For UN3480, passenger aircraft transport is strictly prohibited. The CAO label is mandatory.

6. Operational Timeline Checklist

A practical timeline for a complete export operation is estimated below:

Summary of the Compliance Chain

The legal export of 21700 lithium-ion cells consists of a complete chain:
UN38.3 Test → Transport Classification Certificate → Dangerous Goods Packaging Certificate → Destination Market Safety Certifications (CB/UL/CE) → SOC Control → Declaration → Licensed Transport Carrier.

Each link has its own legal basis, testing standards, and operational procedures. Failure to comply with any single item can lead to cargo detention, financial penalties, or legal liability. Exporters must strictly verify their shipping method (Air/Sea/Land) and destination country requirements well in advance.