Disposable batteries are single-use power sources that are replaced after they run out of charge. Also called primary cells, they're commonly known by their size (such as AA, AAA, or 123) which is defined according to ANSI/IEC standards. These batteries are typically used in flashlights, remote controls, smoke detectors, occupancy sensors, light duty power screwdrivers, and other small devices. They're also used to supply backup power for devices that are primarily powered by electricity. Disposable batteries with alkaline or carbon zinc chemistry can be discarded with everyday trash while lithium batteries should be recycled.