The short answer: an ESS or BESS shipment is ready for booking only when the exact battery model, UN classification, test summary, safety data, packaging method and emergency information all describe the same cargo. Do not book against a generic “lithium battery” file.
Three points for importers and project teams
- The 2024 edition of the IMDG Code, including Amendment 42-24, is mandatory from 1 January 2026. International Maritime Organization
- UN 38.3 is a transport test requirement for the cell or battery type; the test summary must be traceable to the manufacturer, laboratory and model.
- Carrier acceptance, terminal rules and destination permits can add requirements beyond the minimum regulatory file.
The model-level booking pack
| Control | What to collect | Common reason for rejection |
|---|---|---|
| Product identity | Manufacturer, model, chemistry, rated energy, cell and module configuration, gross mass and dimensions | Quotation names one model while the report covers another |
| UN classification | Proper shipping name, UN number, class, applicable special provisions and packing instruction confirmed by a competent DG specialist | Generic “Class 9” description without model-level classification |
| UN 38.3 | Test summary with manufacturer, laboratory, report ID, date, physical description and pass results | Only an MSDS is supplied, or the model cannot be linked to the test report |
| Safety information | Current SDS, emergency contact, handling controls and declared state of charge where applicable | Contradictory chemistry, energy or manufacturer data |
| Packaging and CTU | Approved packaging method, protection against short circuit and movement, lifting plan, securing drawings, container/vehicle packing certificate where required | Industrial cabinet has no engineered lifting or securing method |
| Commercial file | Invoice, packing list, DG declaration, booking form and destination permits | Weight, package count or description differs between documents |
Start with the exact transport configuration
“BESS” can describe very different shipments: standalone cells, modules, battery racks, complete cabinets, a containerized system, or equipment shipped with batteries installed. The applicable entry and packing method depend on how the energy storage system is presented for transport.
Before asking for a rate, freeze a model list and answer:
- Are the cells or batteries shipped alone, packed with equipment, or contained in equipment?
- Is the system new, used, damaged, defective, prototype or intended for recycling?
- Is it shipped as packages, machinery or a freight container that is itself the product?
- What auxiliary dangerous goods are included—coolant, fire-suppression cylinders, fuel or other chemicals?
- Who is the legal shipper/consignor responsible for classification and declaration?
Damaged, defective or recalled batteries require a separate assessment and must never be presented as normal production cargo.
What UN 38.3 does—and does not—prove
The UN Manual of Tests and Criteria provides the transport testing framework for lithium cell and battery types and the information expected in a test summary. UNECE Manual of Tests and Criteria
A valid test summary supports transport classification. It does not by itself prove:
- compliance with the destination's electrical or grid standards;
- suitability of the cabinet design for the project;
- carrier acceptance for a selected voyage;
- safe container lifting, blocking or bracing;
- regulatory approval for installation or operation.
Match the manufacturer, model, mass, watt-hour rating and physical description to the cargo. If a supplier changed cells, busbars, battery-management hardware or enclosure in a way that may affect the tested type, ask for a competent review before shipment.
Packaging, lifting and securing
Industrial ESS cargo often fails operationally because the paperwork is prepared while the physical handling plan is not. Confirm the centre of gravity, lifting points, floor loading, forklift pockets and cabinet orientation. The securing design must tolerate expected transport forces and protect terminals, disconnects, displays and cooling connections.
For containerized systems, record the container number, verified gross mass, seal and packing evidence. If the equipment itself uses a container-like enclosure, confirm whether it is accepted as a cargo transport unit and whether certification plates or structural documents are required.
Carrier pre-acceptance sequence
- Send the complete model-level file before requesting firm space.
- Ask the carrier or DG desk for written acceptance conditions for the proposed origin, transshipment ports and destination.
- Confirm terminal gate-in rules and document cut-offs.
- Do not switch models after acceptance without re-submission.
- Keep the final signed DG declaration and loading evidence with the shipment record.
What to send DDNZ
Provide the model list, chemistry, rated energy, UN 38.3 test summary, SDS, dimensions, gross weight, packaging drawings, origin factory, destination and target ready date. We can prepare a booking-readiness gap list and routing request; the shipper and competent DG professionals remain responsible for final classification and declaration.