Energizer, 8 Pack, 1.4V, AZ13DP-8, zinc air hearing aid batteries. You'll love hearing this: Energizer has its longest-lasting hearing aid batteries ever. And trust us, we know a thing or two about ears. Our PowerSeal Technology protects your devices against leakage, and our zero-mercury design means less impact on the environment. These batteries deliver consistent sound quality across their life span for a better hearing experience. The EZ Turn & Lock technology is easy to use: Just spin the wheel to access the battery, install using our extra-long tabs, and reseal the package to keep the other batteries safely inside. Get our best performance, and enjoy hearing everything the world has to offer.