- UN3536 covers BESS permanently installed in cargo transport units. Not the same as UN3480 (standalone batteries) or UN3481 (batteries in equipment). Wrong classification causes port rejection.
- 7 documents required. Full list: DG Classification Report, DG Packaging Certificate (危包证), Performance Certificate, MSDS, Maritime DG Declaration, Port Filing Approval, and Container Packing Certificate. Missing any one stops your shipment.
- SOC (State of Charge) limits vary by port and carrier. Shanghai MSA recommends 20-50%, Shandong below 50%. Carriers have stricter limits: MSK/COSCO at 30%. No universal standard -- check before booking.
- 2025 new regulations add container design requirements. JT/T 1543-2025 (May 2025) and revised Container Inspection Rules (Oct 2025) add mandatory series/parallel disconnection and structural testing for non-standard UN3536 containers.
In This Guide
- What Is UN3536?
- UN3536 vs. UN3480/UN3481: Key Differences
- Regulatory Framework: IMDG Code SP389
- The 7 Documents Required
- Packaging, Reinforcement and Container Selection
- SOC and BMS Requirements by Port and Carrier
- Multimodal Routing: Factory to Door
- Carrier Selection and Peak Season Space
- China Port Comparison for UN3536
- 2025 Regulatory Changes
- Tracking and Risk Management
- Frequently Asked Questions
- How to Ship UN3536 with Great Hensen
1. What Is UN3536?
UN3536 is the United Nations dangerous goods identifier assigned in 2019 under the 21st revised edition of the UN Model Regulations. Its official proper shipping name is:
UN3536, LITHIUM BATTERIES INSTALLED IN CARGO TRANSPORT UNIT
Class 9, Miscellaneous Dangerous Goods
In plain terms: UN3536 covers containerized battery energy storage systems (BESS), large-scale lithium-ion battery assemblies that are permanently installed within a cargo transport unit (such as a 20ft or 40ft container). These are not batteries packed in a box. They are entire power storage units built into container frames, weighing 10–45 tons each, designed to be transported as complete units.
Since 2019, UN3536 has become one of the fastest-growing DG categories globally. According to the International Energy Agency (IEA), global battery storage capacity additions reached approximately 170 GWh in 2025, more than doubling from the previous year, with China accounting for over 60% of global battery manufacturing. The International Maritime Organization (IMO) has tracked a corresponding increase in lithium battery DG declarations at major ports worldwide. This growth, driven by the rapid expansion of grid-scale energy storage projects in Europe, North America, and the Middle East, has made UN3536 one of the most frequently booked DG categories at major Chinese ports. Chinese manufacturers dominate the global supply of these systems (read our UN3536 case study, 1,000+ TEU shipped).
2. UN3536 vs. UN3480 / UN3481, key differences
Understanding the distinction matters because it determines which regulations apply, what packaging is required, and whether a carrier will accept your cargo.
| UN Number | Description | Typical Cargo | Packaging | Applicable to BESS? |
|---|---|---|---|---|
| UN3480 | Lithium ion batteries (standalone) | Individual battery cells, modules | UN-spec outer packaging required | ❌ Not for installed systems |
| UN3481 | Lithium ion batteries packed with or contained in equipment | Electronics with batteries inside | Equipment provides protection | ❌ Not for container-scale systems |
| UN3536 | Lithium batteries installed in cargo transport unit | Containerized BESS, energy storage cabinets | CTU itself is the packaging | ✅ Specifically for BESS |
3. Regulatory framework: IMDG code special provision 389
UN3536 is governed by IMDG Code Special Provision 389 (SP389). Understanding this provision is essential for anyone shipping BESS from China. According to the International Maritime Organization (IMO), SP389 was incorporated into the IMDG Code to address the unique characteristics of large-format energy storage systems that do not fit conventional DG packaging frameworks.
What SP389 Requires
- The cargo transport unit (CTU) must be designed or modified specifically for the lithium batteries it contains. The batteries must be securely installed within the CTU, no loose modules.
- No ignition sources. The CTU's electrical system must be isolated or designed to prevent unintended activation during transport.
- Ventilation provisions. If the design includes battery management systems with ventilation, these must function safely during transport (or be deactivated and the vents sealed per manufacturer instructions).
- Marking and placarding. The CTU must display Class 9 placards on all four sides, plus the UN number (UN3536) on at least two opposing sides.
- Stowage category. UN3536 is assigned Stowage Category A under the IMDG Code, meaning on deck or under deck on a cargo ship (not applicable to passenger vessels carrying cargo).
- No segregation requirements beyond standard Class 9 provisions, this is a significant operational advantage over other lithium battery entries.
4. The 7 documents required for UN3536 export from China
Based on our experience shipping over 1,000 TEU of UN3536 cargo, here is the complete documentation checklist. Missing any one of these will stop your shipment at port.
| # | Document | Chinese Name | Issued By | Typical Timeline |
|---|---|---|---|---|
| 1 | DG Classification Report | 危险品分类鉴定报告 | Certified lab (e.g., Shanghai Chemical Institute) | 5–7 working days |
| 2 | DG Packaging Certificate | 危险货物包装使用鉴定结果单 (危包证) | Local CIQ (Customs Inspection & Quarantine) | 7–10 working days (expedited: 3 days) |
| 3 | Performance Certificate | 包装性能检验结果单 | Packaging manufacturer / CIQ | 3–5 working days |
| 4 | MSDS | 材料安全技术说明书 | Manufacturer or authorized agent | 2–3 working days |
| 5 | Maritime DG Declaration | 海运危险货物申报单 | Freight forwarder submits to MSA | 3 working days before vessel departure |
| 6 | Port Filing Approval | 港口危险货物作业附证 | Port authority | 5 working days before arrival at port |
| 7 | Carrier DG Acceptance Letter | 船公司危险品接载确认 | Shipping line | 1–2 working days after booking |
5. Packaging, Reinforcement & Container Selection
UN3536 cargo is inherently oversized and overweight. Standard container handling procedures do not apply. Here is what we use:
Container Types by Cargo Specification
| Cargo Weight | Cargo Dimensions | Recommended Container | Notes |
|---|---|---|---|
| Up to 28 tons | Fits standard 40ft | 40ft High Cube Container | Standard option when dimensions permit |
| 28–35 tons | Standard width, extra height | 40ft Open Top Container | Top loading for tall units; requires tarpaulin cover |
| 35–45 tons | Oversized width/height | 40ft Flat Rack Container | No side walls; requires professional lashing & reinforcement plan |
| 20–35 tons | Compact footprint | 20ft SOC (Shipper Owned Container) | Custom-built BESS containers; SOC avoids carrier container liability |
Reinforcement Requirements
- Professional lifting plan, required for any unit over 28 tons. Specifies lifting points, spreader bar requirements, and ground bearing pressure.
- Lashing and securing, steel chains with tensioners (not polyester straps) for flat rack loading. Minimum 4-point tie-down for containers under 30 tons, 8-point for over 30 tons.
- Weather protection, for open top and flat rack shipments: marine-grade tarpaulin or shrink-wrap with desiccant packs inside the battery compartment.
- Shock and vibration monitoring, impact indicators and tilt indicators installed on all four corners. These provide objective evidence of transit conditions for insurance and warranty claims.
6. SOC and BMS requirements by port and carrier
SOC (State of Charge) is the single most common reason for UN3536 shipments to be rejected at booking or held at port. While the IMDG Code imposes no SOC limit for UN3536, individual Chinese ports and shipping lines enforce their own limits, and these frequently change.
SOC Limits by Chinese Port (MSA guidance)
| Port | MSA SOC Recommendation | Special Rules | Verification Required |
|---|---|---|---|
| Qingdao | Below 50% (Shandong MSA) | Great Hensen's home port. UN3536 cargo handled regularly. 24-48h from declaration to approval. | Manufacturer SOC certificate + independent test report |
| Shanghai | 20%-50% (Shanghai MSA) | 7 working days advance MSA filing. SOC below 20% may trigger questions about battery health. | MSA filing receipt + SOC test report |
| Ningbo | Below 50% (Zhejiang MSA) | UN38.3 Test Report mandatory since Oct 2025 for all lithium battery DG bookings. | UN38.3 test report + SOC declaration |
| Shenzhen (Yantian) | Below 50% (Guangdong MSA) | Overweight containers (>30t) require 3-day advance notification + terminal bearing test (>=50t/m²). | Terminal bearing test report for units >30t |
SOC Limits by Carrier (actual booking requirements, July 2026)
| Carrier | SOC Limit | Additional DG Requirements | UN3536 Acceptance |
|---|---|---|---|
| MSK | ≤30% | UN38.3 + SOC certificate + BMS functional test report | All major ports, pre-approval required |
| COSCO | ≤30% | Chinese-language DG declaration + SOC certificate + packing list with battery specs | All Chinese ports, priority for COSCO DG contract holders |
| HPL | ≤50% | UN38.3 + MSDS + SOC certificate | Select ports, 72h advance booking |
| ONE | ≤30% | Full DG documentation pack + independent SOC verification | Limited port acceptance |
| MSC | ≤50% | UN38.3 + SOC declaration + vessel acceptance letter | Major ports, case-by-case |
| CMA CGM | ≤30% | Full IMDG DG declaration + SOC certificate | All ports, DG surcharge applies |
BMS Protection Requirements (JT/T 1543-2025)
China's new industry standard JT/T 1543-2025, effective May 1, 2025, is the first dedicated standard for lithium battery sea transport safety in China. For UN3536 systems, it mandates:
- Series/parallel disconnection is mandatory during transport. Battery strings must be physically disconnected at the BMS level, not just software-disabled.
- Over-charge, over-discharge, and short-circuit protection must be verified functional within 30 days before loading. Test certificates accompany the DG declaration.
- Safety venting system must be operational or sealed per manufacturer instructions with a written statement confirming it is safe for sea transport.
- Temperature monitoring at battery module level is recommended for containers with >10 battery modules. If installed, temperature logs for the 48 hours before loading must be provided.
6. Multimodal routing: factory → Port → European door
Most Chinese BESS manufacturers are located inland, far from coastal ports. We design door-to-door routes that combine multiple transport modes:
Typical Route: Inland China → Europe
- Factory to river port (1–3 days), Specialized heavy-haul trucks transport the BESS units from factory to an inland river port (e.g., Chongqing, Wuhan, Nanjing).
- River barge to seaport (5–10 days), Yangtze River barge to Shanghai, or alternative river routes to Qingdao or Tianjin. Barge transport handles overweight cargo more economically than road.
- Seaport DG handling (3–5 days), Arrival at seaport DG yard. Port filing verification, customs declaration, maritime DG declaration, and container loading under DG-certified supervision.
- Ocean freight to European base port (28–35 days), Direct service to Rotterdam, Hamburg, or Antwerp. All DG documentation pre-filed. Real-time GPS tracking active.
- European inland delivery (3–7 days), Customs clearance at port, then specialized heavy-haul trucks (heavy-lift FAQ) deliver to final destination, typically a solar farm, grid substation, or industrial site anywhere in continental Europe.
7. Carrier selection & peak season space guarantee
Not all shipping lines accept UN3536 cargo, and those that do may restrict it during peak season (August–October) when container space is tight and DG cargo is deprioritized.
We maintain long-term DG booking agreements with eight major carriers. This gives us the ability to secure confirmed DG space even when spot market customers are being turned away:
Our carrier strategy for UN3536 shipments:
- Dual-carrier booking, for critical shipments, we pre-book space with two carriers simultaneously and confirm one 14 days before departure, releasing the other.
- European route specialization, our highest DG booking volume is on the Asia–North Europe trade lane, giving us priority allocation on these services.
- SOC container flexibility, when carrier-owned containers are scarce, we can supply SOC (Shipper Owned Containers) for purchase or lease, eliminating equipment shortages as a bottleneck.
8. China port comparison for UN3536 shipments
All major Chinese ports can handle UN3536 cargo. Differences in filing deadlines, approval timelines, and suitability by factory location and destination should guide port choice.
| Factor | Qingdao | Shanghai | Ningbo | Shenzhen (Yantian) |
|---|---|---|---|---|
| DG handling | DG cargo handling, UN3536 accepted | DG zone at Waigaoqiao and Yangshan | DG acceptance at Chuanshan terminal | DG zone at Yantian terminal 9 |
| MSA filing | 3 working days before vessel departure | 7 working days | 3 working days | 3 working days |
| DG approval | 1-3 working days | 3-5 working days | 2-3 working days | 2-4 working days |
| UN38.3 mandatory | Not mandatory for booking (still required for export) | Required for DG declaration | Mandatory since Oct 2025 | Required for DG declaration |
| Overweight units (>30t) | Accepted with crane capacity verification | Requires Yangshan deep-water terminal | Notify 3 days ahead | 3-day notice + bearing test |
| SOC container | Accepted, no extra fees | Accepted, terminal handling surcharge | Accepted, inspection required | Case-by-case approval |
| Best for | Shandong and northern China manufacturers | Largest carrier selection, highest sailing frequency | Zhejiang/Jiangsu manufacturers | Southern China manufacturers, SE Asia/America routes |
Port choice should be based on factory location, cargo type, carrier preference, and destination. Exporters in Shandong, Hebei, and Henan save inland transport cost by shipping from Qingdao. Exporters in Zhejiang and Jiangsu are better served from Shanghai or Ningbo. Contact us for port-specific routing advice.
9. 2025 regulatory changes affecting UN3536
Three significant regulatory changes took effect in 2025 that directly impact UN3536 shipments from China. Exporters who are unaware of these risk cargo rejection at port. According to the China Ministry of Transport (MOT), these standards were introduced to address the rapid growth in lithium battery exports from Chinese ports.
JT/T 1543-2025: China's First Lithium Battery Sea Transport Standard (May 1, 2025)
This is the most important regulatory update for UN3536 in 2025. According to the China Ministry of Transport (MOT), which issued the standard on January 26, 2025, JT/T 1543-2025 is the first industry standard specifically for lithium battery sea transport safety, developed in coordination with the China Maritime Safety Administration to address the rapid growth in lithium battery exports. Key provisions:
- Mandatory series/parallel disconnection of battery strings during transport
- BMS functional verification within 30 days before loading
- Container structural testing requirements for non-standard UN3536 units (Appendix F: lifting test, vertical impact test, longitudinal securing test)
- Fire suppression system specifications for containers with >100kWh total capacity
Revised Container Inspection Rules (October 1, 2025)
The 2025 edition of China's Container Statutory Inspection Technical Rules, published by the China Classification Society (CCS) under the authority of the Maritime Safety Administration, adds specific design, testing, and periodic inspection requirements for containers used as UN3536 cargo transport units. According to the CCS technical notice, containers must now have a valid CSC Safety Approval Plate AND a classification society inspection certificate (CCS, DNV, or equivalent). Non-standard containers (any design that deviates from ISO 668 dimensions) must pass additional structural tests before first use and every 30 months thereafter.
UN TDG Rev. 24: UN3536 Split into Three Codes (September 2025)
According to the United Nations Economic Commission for Europe (UNECE), UN TDG Revision 24 splits the original UN3536 into three separate UN numbers based on battery chemistry:
- UN3536: Lithium-ion batteries installed in cargo transport unit (unchanged scope)
- UN3563: Lithium-metal batteries installed in cargo transport unit (new)
- UN3564: Sodium-ion batteries installed in cargo transport unit (new)
For the vast majority of current energy storage exporters, UN3536 remains the correct classification. UN3563 applies to a small subset of specialty systems, and UN3564 addresses emerging sodium-ion technology. According to UNCTAD (UN Trade and Development), China accounts for over 60% of global lithium battery exports, making UN3536 classification particularly relevant for Chinese manufacturers. The new codes are being phased into the IMDG Code over 2026-2027. Verify your UN number against the latest MSDS and classification report before each shipment.
10. Tracking and risk management
UN3536 cargo represents high-value assets. According to BloombergNEF's 2025 battery price survey, utility-scale BESS container systems cost approximately $180,000–$450,000 per unit depending on capacity and chemistry, with premium systems exceeding $500,000. Lloyd's List data indicates that marine cargo insurance claims for lithium battery shipments have risen alongside the growth in BESS exports, reinforcing the importance of comprehensive coverage. Tracking and risk management are not optional.
Our Monitoring Protocol
- GPS tracking, each shipment carries a satellite GPS tracker with geofence alerts. Position updated every 15 minutes during ocean transit, every 5 minutes during road/barge segments.
- Shock and tilt monitoring, impact sensors and tilt indicators installed on the cargo unit. Any impact exceeding 5G or tilt exceeding 30° triggers an immediate alert to our operations center.
- Daily status reports, you receive a one-line status update every business day: current location, ETA, and any exceptions.
- War risk and all-risk cargo insurance, coverage from factory gate to final door. We arrange the policy; you only pay the premium.
11. Frequently asked questions
What is the minimum shipment size for UN3536 cargo?
There is no minimum, we ship single units as well as project volumes of 50+ containers. For single units, the fixed costs (documentation, port filing, DG declaration) represent a higher percentage of total logistics cost. For project volumes, these costs are amortized across more units.
Can UN3536 cargo be shipped by rail (China-Europe Railway Express)?
Currently, most China-Europe rail operators do not accept UN3536 cargo. The regulatory framework for DG transport by rail across multiple jurisdictions (China, Kazakhstan, Russia, Belarus, EU) is still developing. We recommend sea freight for UN3536 until rail acceptance is standardized. For non-DG energy equipment, rail is available (18 days door-to-door).
What happens if a shipment is rejected at port?
Port rejection of UN3536 cargo is almost always caused by incomplete or incorrect documentation, typically the DG packaging certificate (危包证) being expired, missing, or mismatched to the cargo. If rejection occurs, the container is moved to a DG holding yard. Storage fees apply (~$50–150/day depending on port). Our process prevents this: we verify every document before the container leaves the factory. In over 1,000 TEU shipped, we have never had a port rejection.
Is insurance different for UN3536 vs. general cargo?
Yes. Standard marine cargo insurance may exclude or limit coverage for lithium battery cargo. We arrange specialist DG cargo insurance that explicitly covers UN3536 shipments, including war risk, strikes risk, and temperature variation damage. The premium is typically 0.3–0.8% of declared cargo value, depending on route and season.
12. How to ship UN3536 cargo with Great Hensen
- Send us your cargo specs, dimensions, weight, battery chemistry (LFP / NMC / other), UN3536 classification confirmation, factory location, and destination address.
- We return a routing plan within 24 hours, recommended port, carrier options, container type, total transit time estimate, and a fixed quotation valid for 30 days.
- Documentation phase, we initiate the classification report, packaging certificate, and MSDS preparation. This runs in parallel with production, so documents are ready when the cargo is.
- Transport execution, inland collection → port handling → ocean freight → destination clearance → final delivery. Single point of contact throughout.
Or call +86 13375320398 | info@GreatHensen.com
UN3536 Energy Storage Logistics: Complete Guides
This pillar page is part of our UN3536 knowledge hub. Explore each topic in depth:
All guides based on 1,000+ TEU shipped by Great Hensen's DG logistics team.
Sources and references
- IMDG Code Special Provision 389 (SP389): IMO International Maritime Dangerous Goods Code, Amendment 42-24. IMO IMDG Code
- JT/T 1543-2025 《船舶载运锂电池安全技术要求》: 交通运输部, 2025年1月26日发布, 2025年5月1日实施. 交通运输部公告
- UN TDG Rev. 24 (2025): UN Model Regulations, 24th revised edition, splitting UN3536 into three codes. UNECE TDG
- Ningbo Port UN38.3 Mandatory Requirement: ONE (Ocean Network Express) advisory, October 2025. ONE Advisory, Seatrade Maritime
- UN38.3: UN Manual of Tests and Criteria, Part III, Sub-section 38.3. UNECE Manual of Tests
- PHMSA Interpretation 25-0015 (April 2025): Clarification on UN3536 placarding requirements. PHMSA 25-0015
- Container Statutory Inspection Technical Rules (2025版): 中国船级社, effective October 1, 2025. Referenced from CCS technical notices.
All operational data based on Great Hensen's shipping records: 1,000+ TEU of UN3536 cargo shipped since 2022. Last verified: July 10, 2026.