Batteries or cells containing sodium must not contain dangerous goods other than sodium, sulphur or sodium compounds (e.g. sodium polysulphides and sodium tetrachloroaluminate). Batteries or cells may must not be offered for transport at a temperature such that liquid elemental sodium present is in the battery or cell unless approved and under the conditions established by the appropriate national authority.

Cells must consist of hermetically sealed metal casings which fully enclose the dangerous goods and which are so constructed and closed as to prevent the release of the dangerous goods under normal conditions of transport.

Batteries must consist of cells secured within and full enclosed by a metal casing so constructed and closed as to prevent the release of the dangerous goods under normal conditions of transport.