You'll be pleased to hear that: Energizer now offers the longest-lasting hearing aid batteries ever. PowerSeal technology protects your devices from battery leakage. These batteries deliver consistent sound quality throughout their lifetime for a better hearing experience. User-friendly EZ Turn Lock twist pack: The batteries can be easily removed and conveniently inserted into your devices thanks to extra-long tabs. Unused batteries are stored safely. Rely on great performance and enjoy listening to everything the world has to offer. Up to one week at room temperature when fully depleted. 675 hearing aid battery, 4 pieces.