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AAA batteries are commonly used in small electronic devices, such as TV remote controls, MP3 players, and digital cameras. Devices that, working at the same voltage, require higher current intensities, use larger size AA batteries. AA batteries have three times the capacity of AAA batteries.
However, with the increased efficiency and miniaturization of modern electronics, many products that had been designed to use AA batteries are being replaced by models that accept AAA batteries. A AAA battery measures 44.5mm in length and 10.5mm in diameter.