Duracell Plus alkaline C batteries - long-lasting power guaranteed Duracell Plus batteries are multi-purpose alkaline batteries suited for everyday devices Duracell offers a wide range of batteries to be used in electronics that require reliable power. Duracell Plus C batteries are multi-purpose alkaline batteries ideal for reliably powering everyday devices that require a kick of additional power. Duralock technology keeps unused Duracell batteries fresh and powered for up to 10 years in ambient storage. These batteries give you the freedom to enjoy the use of your appliances by giving you a product you can rely on. The Duracell Plus batteries are best used when you are looking for reliable, long-lasting power in your pets devices.