Energizer Specialty Alkaline Batteries: A23, A27, N, and AAAA

These compact alkaline batteries are built for devices that need exact sizes and stable output. Use this guide to choose the right cell, avoid mix-ups, and get reliable performance in remotes, penlights, medical meters, and other small electronics.

At a Glance

How to Choose the Right Battery

• Match the code printed on the old battery or inside the battery compartment (e.g., A23 vs. A27, N vs. AAAA). These are not interchangeable.
• Confirm voltage. A23/A27 are 12 V; N/AAAA are 1.5 V. Using the wrong voltage can damage the device.
• Check fit. A27 is slimmer than A23; N is shorter and thicker than AAAA. If it rattles or won’t seat, it’s likely the wrong size.
• Cross‑reference by alternate labels (see table) if your device manual uses different codes.

When to Choose Each Size

A23 (12 V)

• Choose for: Key fobs, garage/door remotes, RF transmitters requiring short bursts of higher voltage.
• Avoid if: Your device specifies A27 (similar length but smaller diameter) or any 1.5 V cell.

A27 (12 V)

• Choose for: Slim remotes and compact alarm/doorbell transmitters.
• Avoid if: The battery bay is sized for A23; A27 will be too narrow and lose contact.

N cell (1.5 V)

• Choose for: Small flashlights and meters designed for a single 1.5 V cylindrical cell labeled N/LR1/E90.
• Avoid if: The device calls for AAAA (longer, thinner) or AAA.

AAAA (1.5 V)

• Choose for: Penlights and stylus-type devices that specify AAAA/LR61/E96.
• Avoid if: The device needs N (shorter, thicker) or AAA.

Expected Runtime (Typical, not guaranteed)

• Key fobs (A23/A27): Often 1–3 years with normal use; frequent locking/unlocking shortens life.
• Wireless doorbells/remotes (A23/A27): About 6–24 months depending on temperature and usage.
• Penlights (AAAA): Typically hours of continuous light (varies widely by brightness and number of cells).
• Small flashlights/meters (N): Commonly a few to several hours of continuous use, longer for intermittent use.

Actual life varies with device current draw, temperature, and on-time. Cold weather and constant-on use reduce runtime.

Installation Tips

1. Power off the device.
2. Match polarity (+/−) as marked inside the compartment.
3. Clean contacts with a dry cloth if you see residue or corrosion.
4. Close the compartment securely and test the device.

Storage and Shelf Life

• Store in original packaging in a cool, dry place; avoid heat (e.g., hot cars) and humidity.
• Do not refrigerate or freeze alkaline batteries.
• Rotate stock: use the oldest first; check the “best by” date on the pack.
• Keep spares separated from metal objects to prevent short circuits.

Safety and Handling

• Small batteries are a swallowing hazard. Keep away from children and pets. If swallowed, seek immediate medical attention.
• Do not recharge, crush, or incinerate primary alkaline cells.
• Do not mix old and new batteries or different brands/sizes in a device.
• Remove batteries from devices you won’t use for an extended period to prevent leakage.

Buying Checklist

• Confirm the exact code (A23, A27, N/LR1, AAAA) and voltage your device requires.
• Look for fresh stock with a distant “best by” date.
• Purchase from reputable sellers to avoid counterfeit or expired cells.
• Consider multi-packs if you maintain several of the same devices.

Troubleshooting After Replacement

• Device still dead: Recheck polarity and ensure the battery seats firmly; gently bend contact springs if flattened.
• Intermittent operation: Clean contacts; verify you chose A23 vs. A27 correctly.
• Remote range is short: Replace again if the battery was old stock; check the remote’s antenna or re-pair/program if required by the device.

FAQ