Article 4 4.

As regards button cells for hearing aids, the Commission shall maintain under review the exemption referred to in paragraph 2 and report to the European Parliament and the Council on the availability of button cells for hearing aids which are in compliance with paragraph 1(a) no later than 1 October 2014. Where justified due to the lack of availability of button cells for hearing aids which are in compliance with paragraph 1(a), the Commission shall accompany its report by an appropriate proposal with a view to extending the exemption referred to in paragraph 2 with regard to button cells for hearing aids.