Duracell’s most groundbreaking innovation yet, Duracell Optimum AA alkaline battery (pack of 4) has a new cathode system that can deliver up to 100% Extra Life in some devices, or Extra Power in other devices. Optimum Performance meets Optimum Packaging Duracell Optimum’s new and innovative ‘book’ style pack has a door and an organiser tray inside, which finally means no more batteries rolling around the kitchen drawer! Instead your batteries remain conveniently and securely stored until you are ready to use them. And once batteries are exhausted, you can re-store them, ready for future recycling.