Duracell MN27 (A27) Specialty Alkaline — Tiny 12V Power for Key Fobs and Mini Transmitters

The Duracell MN27—also known as A27—is a slim, 12-volt alkaline battery used in compact RF remotes and access devices where high voltage is needed but space is extremely limited. You’ll find MN27 in select car remotes, garage and gate transmitters, small security devices, and specialty gadgets. If your device lists “A27,” “MN27,” or “27A,” this is the correct battery—ensuring proper fit, reliable activation, and the RF range your transmitter is designed to deliver.

Why MN27?

• High-voltage burst (12V): Supports strong RF signal transmission in a small package.
• Ultra-slim cylinder: Fits miniature housings that cannot accept larger batteries.
• Dependable shelf life: Keep spares ready for quick swaps when remotes are critical.
• Leak-resistant build: Helps protect tiny spring contacts and PCB traces.

Common Uses

• Automotive key fobs and alarm remotes specified for A27
• Garage/gate openers and compact transmitters
• Wireless doorbells and select security sensors
• Specialty RF gadgets and pointers

Technical Snapshot

• Chemistry: Alkaline (primary)
• Voltage: 12 V
• Designations: MN27 / A27 / 27A (common cross-references)
• Form factor: Slim cylindrical specialty battery

MN27 vs. MN21 (A23)

Both MN27 and MN21 are 12-volt specialty batteries, but they differ in length, diameter, and capacity. They are not interchangeable. Always install the exact code printed on your old battery or device label to preserve fit and RF performance.

Installation Guide

1. Verify code: Confirm “MN27”/“A27” on the old cell or manual.
2. Polarity: Insert with the “+” end toward the positive symbol.
3. Contact care: Clean springs and pads with a dry, lint-free cloth.
4. Close fully: Ensure the door or cap latches completely to maintain range.
5. Test: Check operation at normal distances.

Care, Storage, and Safety

• Store sealed at room temperature; avoid heat and moisture.
• Do not carry loose batteries with coins or keys.
• Remove the cell if storing the device long-term.
• Keep away from children and pets; dispose or recycle responsibly.

Tips to Maximize Performance

• Avoid accidental button presses that drain charge (use cases or holsters).
• Keep contacts clean for strong, consistent RF output.
• If range is weak, reseat the cell and ensure the compartment fully closes.

Troubleshooting

• Intermittent response: Clean contacts and verify the correct code (A27 vs. A23).
• No activation: Re-check polarity and inspect for worn switch domes.
• Short life: Frequent use or extreme temperatures can accelerate consumption.

FAQs

Is MN27 rechargeable?

No. It is a primary alkaline cell and should not be recharged.

Can I use MN21 (A23) instead?

No. Although both are 12 V, the sizes differ and are not interchangeable.

How long does MN27 last?

Runtime depends on use frequency, transmission strength, and environment; infrequent use extends life.

Summary

Duracell’s MN27 (A27) delivers tiny yet powerful 12-volt energy for miniature transmitters. Match the exact code, install correctly, and keep contacts clean to maintain consistent range and reliability.