A23 battery

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An A23 battery (top), alongside AA and AAA batteries for size comparison.
An A23 battery (top), alongside AA and AAA batteries for size comparison.

An A23 battery (also known as 8LR23 or ANSI-1181A) is a dry cell-type battery mainly used in small electronic key fob devices, such as keyless vehicle entry systems, home security systems, and garage door openers.

The shape and aspect ratio of the A23 battery are similar to those of a common AA battery. However, an A23 battery is much smaller than even an AAA battery, measuring only 29 mm long and about 10 mm in diameter, with a typical weight of 8 grams. Furthermore, an A23 battery is an 8-cell device with a nominal voltage of 12 V, while AA or AAA batteries are single-cell devices with a nominal voltage of 1.5 V. The higher voltage is necessary for the radio frequency-transmitting and receiving devices which A23 batteries often power.

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