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An A23 battery is a dry cell that is primarily used in garage door openers, keyless vehicle entry, and Bluetooth headsets. A23 batteries have a higher voltage which is necessary for radio frequency-transmitting and receiving devices. BatteryJunction has the biggest names in batteries, like Duracell A23 batteries and Energizer A23 batteries.
Cross-reference: 1181A, 23, 23A, 23AE, 23GA, 8LR23, 8LR932, A23, A23BP, E23A, GP23, GP23A, GP-23A, K23A, L1028, LR23A, LRV08, MN21, MS21, R23A, V23, V23GA, VR22