Energizer AZ312 Hearing Aid Batteries 1.4 Volt, pack of 4 SKU: 185166 MODEL: AZ312DPA4 Error. try again later You've successfully joined the club $ 6 .28 pack Mitre 10 Variants You'll love hearing this: Energizer has its longest-lasting hearing aid batteries ever. Hearing Aid Battery AZ312. Features and benefits PowerSeal Technology protects your devices against leakage. These batteries deliver consistent sound quality across their life span for a better hearing experience. Zinc Air.