€¢ Assured for 10 years in storage €¢ Long-lasting; reliable alkaline power €¢ High energy density; capable of performance at high discharge rates 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."