MN27 / 27A / A27 12V Battery (Pack of 2) – Uses, Specs, Compatibility & Safety Guide
MN27 / 27A / A27 12V Battery (Pack of 2)
If you need a compact, high-voltage cell for small electronics like key fobs and remote controls, the MN27 (also known as 27A or A27) 12-volt alkaline battery is a popular choice. This page explains what it is, where it fits, how to pick the right replacement, and the essential safety tips—so you can buy with confidence.
At a Glance
- Form factor: slim cylindrical mini-cell
- Nominal voltage: 12V
- Typical capacity: ~20–30 mAh (varies by brand & load)
- Best for: key fobs, car/door remotes, small RF gadgets, wireless doorbells, security sensors, laser pointers
Also Labeled As
A27 27A MN27 L828 V27A GP27AManufacturers use different codes; these typically indicate the same 12V mini alkaline type.
Where the A27 Battery is Used
The A27 is designed for low-to-moderate current bursts in compact devices that require a higher voltage than a single coin cell can provide. You’ll commonly find it in:
- Car key fobs and garage-door remotes
- Wireless doorbell push buttons and RF remote switches
- Small security sensors, trackers, and alarms
- Presenters/laser pointers and select toys or LED gadgets
Key Features & Benefits
- High voltage in a tiny body: Delivers 12V for reliable remote transmissions and RF modules.
- Compact & lightweight: Easy fit for ultra-small battery compartments.
- Alkaline chemistry: Stable performance and long shelf readiness for standby devices.
- Wide cross-compatibility: Multiple equivalent codes make sourcing replacements simpler.
Specifications (Typical)
| Parameter | Value (typical) |
|---|---|
| Nominal Voltage | 12 V (DC) |
| Capacity | ~20–30 mAh (depends on brand & discharge) |
| Dimensions | Length ≈ 28 mm; Diameter ≈ 8 mm |
| Weight | ≈ 4–5 g per cell |
| Chemistry | Alkaline (primary) |
| Operating Use | Intermittent, low-to-moderate current draw |
Note: Exact values vary by brand, storage conditions, and the device’s load profile.
Compatibility & How to Check Fit
- Match the code: Your device or old battery should show A27 / 27A / MN27 / L828 / V27A / GP27A. If the code matches, it’s usually the right fit.
- Measure the compartment: About 28 × 8 mm. If your slot is tighter/looser, re-check the model code.
- Confirm polarity: Ensure the positive (+) and negative (–) ends align with markings inside the device.
Performance Tips for Longer Life
- Store cool & dry: Avoid heat, humidity, and direct sunlight.
- Remove for long storage: If you won’t use the device for months, remove the battery to prevent leaks.
- Clean contacts: If performance drops, wipe the device terminals with a dry cloth before replacing the cell.
- Avoid heavy loads: This cell is not for motors or high-drain gadgets; it’s meant for brief bursts in remotes and similar devices.
Safety & Disposal
- Keep away from children & pets. This is a small cell—choking and ingestion hazards exist.
- Do not recharge, short, or disassemble. A27 is a primary (non-rechargeable) cell.
- Replace all at once: Don’t mix fresh and used cells in the same device.
- Recycle responsibly: Follow local e-waste rules; never incinerate.
FAQs
Q. Is A27 the same as 27A or MN27?
A. Yes—those are common equivalent codes for the same 12V alkaline mini-cell.
Q. Can I use this instead of an A23 battery?
A. No—A23 is similar but slightly larger in diameter and uses a different internal stack. Use only what your device specifies.
Q. Why does my remote still not work after replacement?
A. Check orientation (+/–), clean contacts, and confirm the device actually requires A27. If issues persist, the device itself may be faulty.
Why Buy This Pack of 2?
- Always have a spare: Perfect for remotes that fail at the worst time.
- Matched pair: Same production batch for consistent performance.
- Compact storage: Easy to keep in a toolbox, car glove box, or drawer.
