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. 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. Battery features long lasting power: duracell alkaline batteries are designed and developed for long lasting performance. Guaranteed for 10 years in storage: duracell d alkaline batteries are guaranteed for 10 years in storage. #1 trusted battery brand: duracell coppertop batteries are available in double a (aa), triple a (aaa), c, d and 9v sizes.