Duracell Optimum has powerboost ingredients that makes it our best performing alkaline battery.With its patented technology it delivers more power in some devices/more life in others vs next best Duracell alkaline.Duracell Optimum’s pack is 100% recyclable,it has a door and an organizer tray inside, which means no more batteries rolling around the drawer. Instead your batteries remain conveniently and securely stored. And once batteries are exhausted, you can re-store them, ready for future recycling.