With 4X the exclusive POWER BOOST Ingredients, as compared to the Coppertop line, Duracell Optimum is the #1 best-performing alkaline battery, delivering superior power for your most demanding devices. These batteries are stored in a convenient, re-closable package for quick, easy access and safe storage, keeping them organized and protected. Duracell also guarantees these batteries against defects in material and workmanship, ensuring reliable quality you can trust. Duracell Optimum AAA alkaline batteries are guaranteed for 12 years in storage, so you can rest assured they will be ready when you need them. From storm preparation to holiday needs, Duracell is the #1 trusted battery brand worldwide.