Voila!!
http://www.efra.ws/rules/Handb09App3.pdf
See Rule 3.2.2 The Battery Homologation Officer is Paul Worsley, same address, as shown by this organisation chart:
http://www.efra.ws/the_board_2.htm
So, send the batteries to Paul, ask for BRCA and EFRA homologation, and that should start the process going. HTH