IATA Dangerous Goods Regulations

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ADR, RID and ADN

The international agreements for carrying dangerous goods by road (ADR, under UNECE), rail (RID, under OTIF) and inland waterway (ADN), revised together every two years in line with the UN Model Regulations. They set how lithium cells and batteries are classified, packed, marked and documented on land; the rules for damaged or defective batteries sit in special provisions 376 and 377.

49 CFR

Title 49 of the US Code of Federal Regulations, whose Hazardous Materials Regulations, issued by PHMSA, govern shipping batteries within and from the United States. Section 173.185 covers lithium cells and batteries: every design must pass UN 38.3, small cells and batteries get lighter rules, and damaged or recalled ones may travel only by road, rail or vessel.

IEC 62281

The IEC standard setting test methods and requirements that keep primary and rechargeable lithium cells and batteries safe while they are shipped; transport for recycling or disposal is outside its scope. It closely tracks the UN 38.3 test sequence, with an annex listing where the two differ. The current edition is the fourth, of 2019, amended in 2021 and 2023.

IMDG Code

The IMO’s code for carrying packaged dangerous goods by sea, mandatory under the SOLAS convention since 2004 and amended every two years. It sets how lithium and sodium-ion batteries are classified, packed, stowed and segregated on ships; amendment 42-24, mandatory from 2026, added separate entries for lithium-ion, lithium-metal and sodium-ion battery-powered vehicles.

Shipping state of charge

The state of charge at which cells leave the factory and travel, kept low to reduce both calendar aging and the energy available in an incident. Air-freight rules cap lithium-ion cells shipped alone at 30 %, and plants often target 10–20 %.

UN 38.3

The United Nations test sequence that every lithium cell and battery must pass before it can be shipped: altitude, thermal cycling, vibration, shock, external short, impact or crush, overcharge and forced discharge. Air shipment of cells also caps state of charge at 30 %.

References & further reading

Further reading on this topic

These sources provide broader context; they are not presented as citations for every statement in this entry.

1. UN Manual of Tests and Criteria, Revision 8

   United Nations Economic Commission for Europe · 2023

   Topic background · Dangerous-goods classification tests; subsection 38.3 concerns battery transport testing.

2. Manual of Tests and Criteria, Revision 8, Amendment 1

   United Nations Economic Commission for Europe · 2025

   Topic background · Amendments to Revision 8, including changes to battery testing in subsection 38.3.