The Ansmann Zinc Air ZA312 PR41 is a pack of 6 hearing aid batteries commonly known as the brown pack. These cells are 1.4V and weigh 0.54g. Application range Analog and digital hearing aids Diameter 7.9 mm Height 3.6 mm 6 battery dial pack Also known as DA312, AC312, PR312H, ZA 312, HA312, V312A,