Duracell AAAA (MN2500) Specialty Alkaline Battery — 1.5V for Slim Devices

Duracell AAAA (MN2500) is a slim 1.5V alkaline cell designed for narrow, lightweight electronics such as active stylus pens, laser pointers, glucose meters, digital thermometers, and pen lights. It offers stable output, leak-resistant construction, and dependable shelf life to keep compact devices responsive between planned battery changes.

When to Choose This Battery

• Use if your device explicitly lists AAAA, MN2500, E96, 25A, or IEC LR8D425.
• Choose for pen-style or tube-shaped devices where AAA cells do not fit.
• Avoid if your device requires AAA, coin/button cells, or a rechargeable pack.

Compatibility and Aliases

Also known as: MN2500 (Duracell), E96 (Energizer), 25A (ANSI), LR8D425 (IEC). These designations refer to the same AAAA size and are cross-compatible when chemistry and voltage match.

Specifications

• Chemistry: Alkaline (primary, non-rechargeable)
• Voltage: 1.5V
• Size: AAAA (MN2500)
• Typical dimensions: ~42.5 mm L × ~8.3 mm Ø

AAAA vs. AAA at a Glance

Size	Dimensions (approx.)	Common Uses
AAAA	42.5 × 8.3 mm	Stylus pens, pen lights, medical instruments
AAA	44.5 × 10.5 mm	Remotes, small toys, headlamps

These sizes are not interchangeable.

Expected Runtime (Typical Scenarios)

• Active stylus pens: weeks to a few months, depending on daily use and idle timeout.
• Pen lights: tens of minutes to a few hours based on brightness and driver efficiency.
• Glucose meters/thermometers: several months under light, intermittent use.

Actual runtime varies with device current draw, ambient temperature, and power management features.

Installation Checklist

1. Confirm size labeling: AAAA/MN2500/E96 on the device or manual.
2. Insert with correct polarity; align the positive button with the “+” mark.
3. Wipe contacts with a dry, lint-free cloth before closing the cap.
4. If the device uses multiple cells, replace all at the same time.

Best Practices

• Store spares at room temperature in original packaging; avoid heat and humidity.
• Turn devices off when not in use; enable auto-sleep on stylus pens if available.
• Remove batteries from devices stored long term to reduce leakage risk.
• Do not mix old and new batteries or different brands within the same device.

Safety Notes

• Non-rechargeable: do not attempt to recharge alkaline AAAA cells.
• Keep out of reach of children; seek medical help if swallowed.
• Do not short-circuit, crush, or disassemble. Do not harvest cells from a 9V battery.
• Recycle or dispose of used cells according to local guidelines.

Troubleshooting

• Intermittent stylus strokes: Reseat the cell, clean contacts, and confirm polarity.
• Short runtime: High-brightness lights and always-on Bluetooth drain faster; lower brightness or reduce continuous use.
• No power: Verify the size is AAAA (not AAA) and that the cap fully closes without spring binding.

Alternatives

• Rechargeable options: AAAA rechargeables are uncommon and often incompatible. Use only if the device manual explicitly allows them.
• Different sizes: If your device specifies AAA, AA, or coin cells, do not substitute AAAA; choose the exact size required.

FAQs

Is AAAA the same as E96 or MN2500?

Yes. E96 (Energizer), MN2500 (Duracell), 25A (ANSI), and LR8D425 (IEC) are designations for the same AAAA size.

Can I use lithium or rechargeable AAAA instead of alkaline?

Only if your device documentation explicitly supports it. Most AAAA devices are designed for 1.5V primary alkaline cells.

How should I store spare AAAA batteries?

Keep them in original packaging at room temperature, dry conditions. Avoid extreme heat and do not refrigerate or freeze.

What if the battery leaks?

Power off the device, wear gloves, and clean contacts carefully with a cotton swab slightly dampened with isopropyl alcohol. Replace the battery and test. If corrosion is severe, seek professional service.