Duracell C-size batteries are universal alkaline batteries that will become a reliable power source for frequently used devices that need extra power. Due to the special Duralock technology, unused Duracell batteries can retain a charge up to 10 years when stored under normal conditions. With these batteries you can completely rely on your device. Duracell batteries are the best choice if you are looking for a reliable and durable power source for commonly used devices, such as motorized toys, flashlights, portable game consoles, remote controls, CD players, etc.