Duracell CopperTop All-Purpose Alkaline batteries are not only dependable, they’re also long-lasting. You can take comfort in Duralock Power Preserve Technology that gives you a 10-year guarantee in storage. Plus, they’re great for important devices in your home like smoke and carbon monoxide detectors. And since Duracell is the #1 trusted brand of first responders and firefighters, you know they’re a battery you can trust.