Duracell Coppertop batteries with POWER BOOST? Ingredients deliver dependable power to your everyday devices throughout the home, like toys, remote controls, flashlights, calculators, clocks and radios, wireless mice, keyboards, and more. With a guarantee of 12 years in storage, you can rest assured they'll be ready when you need them. Duracell guarantees these batteries against defects in material and workmanship. From storm season to holiday needs, Duracell is the #1 trusted battery brand for the moments that matter most.