AA batteries power devices such as headlamps, digital cameras, and battery-operated screwdrivers. These 1.5V batteries have a nominal diameter of 14mm.

AAA batteries power small devices like remote controls. These 1.5V batteries have a nominal diameter of 11mm.

AAAA batteries are the smallest type of standard disposable battery. They power extra-small devices such as laser pointers. These 1.5V batteries have a nominal diameter of 8mm.

C batteries power mid-sized devices such as flashlights and small portable radios. These 1.5V batteries have a nominal diameter of 26mm.

D batteries are the largest type of standard disposable battery. They power large devices such as lanterns and portable stereos. These 1.5V batteries have a nominal diameter of 33mm.

9V batteries power devices such as smoke alarms, carbon monoxide detectors, clocks, and walkie-talkies. They are sometimes called smoke-alarm batteries.