By Kim Lewis – Updated March 24, 2022
AA batteries are the most common household power source. They are dry cells that use an electrolyte paste to conduct electricity. When a load is applied, a thin metal rod reacts with the paste to generate a steady voltage.
The journey of battery technology began with Italian physicist Alessandro Volta, who created the first chemical battery. Dry‑cell technology was later pioneered by Japanese clockmaker Sakizou Yai and formalized by German chemist Carl Gassner. Thomas Edison introduced the first alkaline battery, but it was Canadian engineer Lewis Urry who produced the first compact alkaline cell and later invented lithium chemistry.
Typical AA batteries measure approximately 1.988 inches in height and 0.0571 inches in diameter. They feature a steel casing and, in the most common alkaline formulation, deliver a nominal voltage of 1.5 V.
To maximize lifespan and prevent corrosion, avoid storing AA batteries in pockets or bags that contain metal objects such as coins or paper clips. When a device is not used frequently, remove its batteries to reduce self‑discharge.
