A23 battery: equivalents & specs
The A23 is a stubby 12 volt alkaline battery, 10.3 mm across and 28.5 mm long, built from eight tiny cells stacked in one sleeve. Sold as 23A, MN21, V23GA or L1028, it powers garage remotes, doorbells and other small radio transmitters.
Same battery, other names
Every code below is the exact same cell as A23. Any of them will fit and work identically.
Compatible replacements
- A27: Slimmer 12 V cousin (8.0 mm vs 10.3 mm diameter) with less than half the capacity; the two are not interchangeable.
Buying and replacement notes
Twelve volts from something smaller than a AAA surprises people: inside are eight LR932 button cells in series, which explains both the high voltage and the tiny 55 mAh capacity. It exists purely for intermittent transmitter duty. Radio range shrinking is the classic sign of a fading A23. The similarly named A27 is thinner and even lower capacity; remotes are keyed to one or the other.
Commonly used in
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⚠️ Keep away from children. Swallowed button batteries, especially 20 mm lithium coins, cause severe injury within hours. If a child swallows one, call the 24/7 National Battery Ingestion Hotline (US) at 800-498-8666 or poison control at 800-222-1222 immediately. What every parent should know.