Article 4 2.

At trade fairs, exhibitions, demonstrations or similar events, Member States shall not prevent the showing of batteries which do not comply with this Regulation, provided that a visible sign clearly indicates that those batteries do not comply with this Regulation and that they cannot be made available on the market or put into service until they have been brought into conformity with this Regulation. During demonstrations of such batteries, the relevant economic operator shall take adequate measures to ensure the safety of persons.