Duracell CopperTop AA Alkaline Battery (4-Pack) dependable and long-lasting power for all your household devices. Featuring Duralock Power Preserve Technology, these batteries are to hold their charge for up to 10 years in storage, ensuring they are ready when you need them most. I for use in toys, remote controls, flashlights, calculators, clocks, radios, portable electronics, and more, these batteries provide reliable performance you can trust. Model Number: 3561