Duracell 123 is a type of alkaline battery. The number "123" designates the size of the battery, known as an "LRV08" size or AAAA. The Duracell 123 battery is 1.5V and is designed to provide long-lasting, reliable power to a wide range of small portable electronics, such as: calculators, keyless entry systems, remote controls, watches and other small devices. In addition, Duracell 123 batteries have a long shelf life, so they can be stored for up to 7 years without losing a lot of their charge.