Duracell CopperTop All-Purpose alkaline batteries are not only dependable, they?re also long-lasting. You can take comfort in a 10-year guarantee in storage with Duralock Power Preserve Technology. They?re great for many of the devices you use on a daily basis in your home. And from storm season to medical needs to the holidays, Duracell is the #1 trusted battery brand of first responders, pharmacists and parents, so you know it?s a battery you can trust.