Duracell Plus Power D batteries – long lasting power guaranteed. These multi-purpose batteries are ideal for reliably powering everyday devices. Duracell Plus Power batteries give you the freedom to enjoy the use of your appliances by giving you a product you can rely on. The Duracell Plus Power batteries are best used when you are looking for reliable, long-lasting power in your every-day devices such as flashlights. Duralock technology keeps unused Duracell batteries fresh and powered for up to 10 years in ambient storage.