A21 Battery (also known as 8LR23 or ANSI-1181A) is a dry cell-type battery mainly used in small electronic key fob radio devices, such as keyless vehicle entry systems, home security systems, garage door openers, and Bluetooth headsets. A21 Battery is cylindrical, smaller than an AAA battery, measuring only 28.9 mm long and 10.3 mm in diameter, with a typical weight of 8 grams; however, this battery must not be confused with a similar single-cell N battery.
A21 Battery is an 8-cell device with a nominal voltage of 12 V. The higher voltage is necessary for the radio frequency-transmitting and receiving devices which this battery often power. It has a capacity of around 55 mAh.
A21 Battery cross reference to the following battery:
- Energizer: A23
- Duracell: MN21
- VARTA: V23GA
- EVEREADY: A23
- NEDA: 1811A
- IEC: 3LR50
- Panasonic: LR-V08
- ELPA: SES-23A
A21 Battery is compatible with the following models:
BAT012, MN21 Alkaline, L1028, A23, A23 Alkaline, 23A Alkaline, 8LR932, BAT-012, 23A, K23A, BAT012 Innotek, 1811A, EL12 Alkaline, 23GA, GP23A, N21 Alkaline, MS21, E23A Alkaline, GP23A Alkaline, 8F10R,