The Duracell rechargeable battery is the most powerful rechargeable battery in the Duracell and it is available in one of the most commonly used sizes of battery-the AA size battery. The AA size battery is used in a multitude of regularly used devices, around the home and the workplace. When a piece of equipment/gadget is used often, high amounts of energy can be consumed, no matter how powerful the battery is, so the ability to recharge instead of replace would be ideal. The Duracell AA rechargeable battery holds its power 80% more efficiently than the Duracell Plus AA rechargeable battery, making it last that bit longer when in use. Using its DuraLock technology it will in fact contain its power for up to 1 year when not in use.