Although designed for general use in high energy consuming devices such as cameras and Bluetooth enabled computer equipment and many more, the Duracell Ultra AA battery is one of the most cost effective of its kind. With 40% more power than the Duracell Plus AA battery, and its ability to keep that power lasting longer, the Duracell Ultra AA battery would not need to e replaced as often as a Duracell Plus AA battery, making it the more economical choice when buying standard sized batteries designed for general use.