CR123A Batteries, commonly referred to simply as 123 batteries, are high power lithium based batteries used extensively in security alarm systems. Due to their high capacity and long life, they are the choice of PIR sensor manufacturers in wireless alarm system. In this application, a CR123A battery can last for up to 3 years between changes.
What's more, the lithium nature of CR123A batteries allows a shelf-life of up to 10 years prior to use making storage simple. Also referred to as CR17345 and DL123A, the CR123 battery is also used in professional photography equipment. It is 34mm in height and 17mm in diameter with a nominal capacity of 1500mAh and can replace SF123 and Innotek BAT-003 battery.