The Duracell Plus AA battery holds 30% more storage than a basic Duracell AA battery, even after being on the shelf for up to ten years. As a standard sized battery, the Duracell Plus AA battery is useful in a multitude of devices, such as flashlights, clocks and many types of controls, but what makes it stand out next to a basic AA sized battery is the high reliability and durability in its performance.With the DuraLock feature, this pack of 12 can be stored away without losing its energy during its fantastic shelf life of up to ten years.