A23 (12V) Batteries

A23 batteries (also labeled 23A, MN21, GP23A, V23GA, 23AE) are miniature 12-volt alkaline cells used in small electronics that need short, high-voltage bursts—especially RF remotes and wireless sensors. If your device or manual specifies “A23” or one of the equivalents below, this is the correct category.

Quick specs

• Voltage: 12 V (primary, non-rechargeable)
• Typical capacity: 50–60 mAh
• Size: ~10.3 mm diameter × 28.5 mm length
• Chemistry: Alkaline
• Common equivalents: A23, 23A, MN21, 23AE, GP23A, V23GA, E23A
• Typical shelf life (sealed): about 2–3 years

Common uses

• Car key fobs and keyless entry remotes
• Garage door openers
• Wireless doorbells and chimes
• Alarm contacts, PIR motion sensors, and window/door transmitters
• RF triggers and small remote controls
• Laser pointers and select toys

How to choose the right A23

• Match the code: Check your device, old battery, or manual for A23/23A/MN21/V23GA equivalents. Use only the specified type.
• Check freshness: Prefer batteries with a “best before” date 2+ years out. Older stock can deliver shorter runtime.
• Operating temperature: Most A23 cells perform best around 0–50°C (32–122°F). For outdoor devices, choose reputable brands and replace more often in cold weather.
• Pack size: Single packs are convenient for one-off replacements; multipacks reduce cost per cell if you maintain several devices.
• Safety packaging: Choose child-resistant packaging if there are kids in the home.
• Brand and warranty: Established brands often provide better leakage control and consistent capacity.

A23 vs A27 (and other look-alikes)

Tip: If your device calls for A23, using A27 may cause poor performance or no operation due to the smaller diameter and lower capacity.

Expected runtime (typical ranges)

• Key fobs and garage remotes: about 6–24 months depending on use (button presses, proximity unlock features) and temperature.
• Wireless doorbells/transmitters: roughly 6–18 months depending on signal strength and standby drain.
• Security sensors: varies widely; some last 6–12 months if they transmit frequently, longer if motion/contacts are infrequent.

Real-life runtime depends on standby current, transmission power, and environment. Cold weather and weak RF links shorten life.

Installation and care

• Insert with the correct polarity (+/−) as marked in the device.
• Do not mix old and new cells, or different brands within the same device.
• Remove the battery if storing the device long term to reduce leakage risk.
• Store spares in a cool, dry place in original packaging; avoid pockets or drawers with loose metal objects.
• If range or responsiveness drops, replace the battery and clean the device contacts with a dry cloth.

Safety and disposal

• Non-rechargeable: Do not attempt to recharge A23 batteries.
• Keep out of reach of children and pets. Small batteries can be a choking hazard.
• Do not short-circuit, crush, or incinerate.
• Dispose of according to local regulations; many retailers accept batteries for recycling. Tape terminals before disposal to prevent shorting.

FAQ

Are A23 and 23A the same battery?

Yes. A23, 23A, MN21, 23AE, GP23A, and V23GA are commonly used equivalent designations for the same 12 V size.

Can I use a rechargeable A23 replacement?

Rechargeable “A23-sized” options typically have a lower nominal voltage (often 8.4–9.6 V) and may not work reliably. Use them only if your device explicitly supports them; otherwise choose standard alkaline A23.

Can I substitute A27 for A23?

No. Although both are 12 V, A27 is slimmer and has much lower capacity. Use the exact type your device specifies.

How long do A23 batteries last in storage?

Sealed spares generally hold up for about 2–3 years. Buy from fresh stock and check the date code for best results.

Why does my remote still have poor range after replacing the battery?

Possible causes include dirty contacts, a misaligned antenna, interference, or the device needing re-pairing. Clean the contacts, re-sync if applicable, and ensure the correct battery type is installed.