Duracell CopperTop all-purpose alkaline batteries are not only dependable, they’re also long-lasting. You can take comfort in a 10-year guarantee (a 5-year guarantee for 9V) in storage. 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 battery brand * so you know it’s a battery you can trust. Duracell CopperTop batteries are available in AA, AAA, C, D and 9V sizes.