Get dependable, long-lasting power from 9-Volt CopperTop batteries for your toys, remote controls, flashlights, clocks, radios and more. These batteries have been engineered to deliver the power you need for all your household devices. Duralock Power Preserve Technology holds a charge for 5 years in storage.Get dependable, long-lasting power from 9-Volt CopperTop batteries for your toys, remote controls, flashlights, clocks, radios and more. These batteries have been engineered to deliver the power you need for all your household devices. Duralock Power Preserve Technology holds a charge for 5 years in storage.