Duracell Coppertop Alkaline batteries are crafted and infused with triple corrosion protection for battery power you can count on. This eight-pack of high performance 1.5-volt batteries will last in storage for up to 10 years, so you can rest assured that they will be ready when you need them. Duracell D batteries provide long-lasting power to your everyday household devices such as toys, remote controls, flashlights, calculators, clocks and radios, portable electronics, wireless mice, keyboards, and more.