- 8-pack of size 13 zinc air hearing aid batteries with EZ Turn & Lock design- Our longest-lasting hearing aid battery ever provides long-lasting performance to your device- Made with PowerSeal Technology to protect your devices from leakage*- Extra-long coloured tabs for easy installation- Holds power for up to 4 years in storage- EZ Turn & Lock packaging makes handling and storing the batteries easy - Delivers consistent sound qualityEnergizer® is the world's No.1 speciality brand*. Get our best performance, and enjoy hearing everything the world has to offer.-Based on scan sales.Our longest lasting ever!