Duracell Power Boost CopperTop Alkaline AAA Batteries, 36/Pack. Duracell® Coppertop® AAA 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.