An AAA battery is a small cylindrical battery commonly used to power various electronic devices, such as remote controls, flashlights, and toys. It typically measures about 44.5 mm in length and 10.5 mm in diameter. AAA batteries come in different types, including alkaline, lithium, and rechargeable nickel-metal hydride (NiMH), each offering varying capacities and performance. These batteries are widely available and are known for their convenience and portability. The AAA battery is part of a standardized battery size classification, which also includes other sizes like AA, C, and D. This standardization makes it easy to find compatible batteries for many devices.