This reliable battery with longer lasting performance than a regular AA battery also holds 30% more power than a regular battery of its size. As a standard sized battery the Duracell Plus AA battery is useful in a large variety of devices, both in the home and in the work place. Due to its durability, the Duracell Plus AA battery demonstrates itself to be a cost effective purchase, because it does not need to be replaced quite as often as a regular AA sized battery. Although available to buy as an individual pack, this pack of 20 is available to buy in bulk quantities and with a storage life of up to ten years; this option could also prove to be the most cost effective option.