Duracell Copper Top All-Purpose alkaline batteries are not only dependable, they are also long-lasting. You can take comfort in a 10-year guarantee (5-year guarantee for 9-Volt) in storage with Duralock Power Preserve Technology. They are 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 No.1 trusted battery brand so you know its a battery you can trust. Copper Top batteries are available in AA, AAA, C, D and 9-Volt sizes.