Duracell CopperTop All-Purpose Alkaline batteries are not only dependable, they’re also long-lasting. They’re great for many of the devices you use on a daily basis in your home. You can take comfort in Duralock Power Preserve Technology that gives you a 10-year guarantee in storage. And because Duracell is the #1 trusted brand of parents, pharmacists and first responders, you know it’s a battery you can trust.