Upgrade your device with Duracell?s most groundbreaking innovation yet. Duracell Optimum batteries have a proprietary cathode system that can deliver Extra Power in some devices, or Extra Life in other devices, vs Coppertop AA/AAA, in a wide range of devices. Optimum Batteries are packaged in a slider pack with a resealable storage tray, that provides a more organized way to store your batteries (no more loose batteries everywhere). Duracell is the #1 trusted battery brand, and we?re proud to offer you Duracell 1 5-Volt Optimum Alkaline AA batteries as part of Duracell?s trusted lineup of batteries.