Phonak 312 Mercury Free Hearing Aid Battery x60 Cells (10 packets) by KEEPHEARING LTD By | September 26, 2017 - 6:56 am |September 26, 2017 Phonak Hearing Aids For Genuine Phonak Batteries supplied by Phonak UK please ensure you order from KEEPHEARING LTD. Product Features For Genuine Phonak Batteries supplied by Phonak UK please order from KEEPHEARING LTD Size 312 (Brown tab) Mercury Free. Expires Feb 2020. 60 cells Supplied (10 packets of 6) Great Performance and Long Lasting Click Here For More Information Tagged Battery, Cells, Free, Hearing, Keephearing, Mercury, Packets, Phonak. Bookmark the permalink.