# The Batteries and Accumulators (Containing Dangerous Substances) Regulations 1994, Paragraph 1


The separate collection mark shall cover 3% of the area of the largest side of the battery or accumulator, up to a maximum size of 5 cm × 5 cm. For cylindrical cells the mark shall cover 3% of half the surface area of the battery or accumulator and shall have a maximum size of 5 cm × 5 cm.
Where the size of the battery or accumulator is such that the mark would be smaller than 0.5 cm × 0.5 cm, the battery or accumulator need not be marked but a separate collection mark measuring 1 cm × 1 cm shall be printed on the packaging.

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Source: https://www.legislation.gov.uk/uksi/1994/232/schedule/3/paragraph/1 (the official version)
Page: https://openlegislation.uk/batteries-and-accumulators-containing-dangerous-substances-regulations-1994/schedule-3/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.