Duracell's most groundbreaking innovation yet! The all-new Duracell Optimum alkaline battery has a new cathode system that can give your device Extra Life*-like toys that run longer-or Extra Power*-like brighter flashlights. Optimum Batteries are packaged in a new slider pack with a resealable storage tray, that provides a more organized way to store your batteries (no more loose batteries everywhere! ). *Extra Life or Extra Power vs. Coppertop AA in a wide range of devices.