The Duracell Plus size D battery is useful in many consistently used energy draining devices and withholds 30% more power than that of the standard Duracell size D battery. They are used in many regularly used devices powering them with dependable long lasting energy. With a shell life of up to ten years this pack of 2 Duracell Plus size D batteries, even when bought in a bulk quantity they will maintain their dependable and long lasting energy.