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. From storm season to medical needs to the holidays, Duracell is the #1 Trusted Brand of Firefighters, Police, and First Responders, so you know its a battery you can trust.