Article 21 4.

The symbol shown in Annex II shall cover at least 3 % of the area of the largest side of the battery, accumulator or battery pack, up to a maximum size of 5 × 5 cm. In the case of cylindrical cells, the symbol shall cover at least 1,5 % of the surface area of the battery or accumulator and shall have a maximum size of 5 × 5 cm.