Duracell CopperTop all-purpose alkaline batteries are not only dependable, they?re also long-lasting. You can take comfort in a 10-year guarantee (5-year guarantee for 9V) in storage. They?re great for many of the devices you use on a daily basis. And from storm season to medical needs to the holidays, Duracell is the #1 trusted battery brand so you know it?s a battery you can trust.