Energizer A27 Battery

Energizer A27 Battery Overview

The Energizer A27 is a slim 12-volt alkaline battery designed for compact remotes and transmitters that need a quick, high-voltage pulse in a small compartment. Common uses include car key fobs, garage/gate remotes, small wireless alarms, and narrow laser pointers.

Choose It / Avoid It

• Use if your device or old cell is marked A27, 27A, MN27, or L828.
• Use when the battery bay is narrow and a wider A23 will not fit.
• Avoid if your device calls for A23, coin cells (CR types), AA/AAA, or any rechargeable format.
• Avoid in high-drain, continuous-run devices; A27 is optimized for short transmit bursts.

Cross-References

• Also known as: 27A, MN27, L828
• Chemistry: Alkaline (primary, non-rechargeable)
• Nominal voltage: 12 V

Key Specifications

Compatibility: A27 vs A23

A27 and A23 are both 12 V alkaline batteries but differ in size. They are not interchangeable.

• A27: ~8.0 mm diameter, ~28 mm tall (slimmer)
• A23: ~10.3 mm diameter, ~28.5 mm tall (wider)

Match the code on your old battery or device manual. Forcing the wrong size can damage contacts or prevent the cover from closing.

Performance & Runtime

• Key fobs and garage remotes: typically 6–18 months depending on use frequency, temperature, and transmitter power.
• Cold weather can reduce output temporarily; testing range indoors can help isolate temperature impact.
• First replacement cue: reduced remote range or needing multiple presses.

Pack Sizes & Buying Advice

• Single/twin packs: one immediate replacement plus a spare for home users.
• 4–8 packs: households with multiple vehicles/remotes.
• Sleeves (10–25) or inner cases (50–200): installers, HOAs, service counters.
• Master cases (200–1,000): dealerships, property managers, distributors.

Installation Tips

1. Confirm size: look for A27/27A/MN27/L828 on the device or old cell.
2. Observe polarity: align (+) and (–) with the device diagram.
3. Clean contacts: wipe gently with a dry, lint-free swab if dull or oxidized.
4. Close firmly: some remotes rely on cover pressure for solid contact.
5. Range test: verify operation from a few yards/meters away.

Troubleshooting

• No response: re-check polarity and ensure the battery is fully seated.
• Intermittent function: inspect for worn or bent contacts; clean and retry.
• Fast drain: ensure no button is stuck; replace and test again.
• Still failing: consult the device manual to re-pair/sync the remote.

Storage & Shelf Life

• Store cool and dry (ideally 50–77°F / 10–25°C), away from heat and humidity.
• Keep sealed in original packaging until use; rotate first-in, first-out.
• Unopened alkaline mini cells commonly hold charge for multiple years; always check the date code on the package.

Safety & Disposal

• Do not recharge—A27 is a primary alkaline cell.
• Keep away from children and pets; small batteries can be a choking and ingestion hazard.
• Do not mix old and new cells in devices that use multiple batteries.
• Recycle or dispose per local guidelines; many retailers accept household batteries.
• No added mercury in modern alkaline cells; still handle and dispose responsibly.

FAQ

Is A27 the same as 27A or MN27?

Yes. These codes refer to the same size and are commonly used interchangeably.

Can I substitute A23 for A27?

No. A23 is wider and typically will not fit an A27 bay.

How long does an A27 last in a key fob?

Often 6–18 months depending on usage frequency, transmitter power, and temperature.

What pack size should I buy?

For one remote, a twin pack covers an immediate fix and a spare. For families, 4–8 packs reduce trips. For service teams, sleeves or inner cases lower per-unit cost and downtime.

Any storage tips?

Store cool, dry, and sealed. Avoid hot cars; keep a spare indoors and rotate annually if you stock many.

Quick Checklist

• Match the code: A27/27A/MN27/L828.
• Confirm fit: do not substitute A23.
• Install with correct polarity and clean contacts.
• Keep one sealed spare; store cool and dry.
• Recycle used cells responsibly.