Is Your Defibrillator Ready? Check the Battery & Pads & Indicator Lights

Your AED should never be a “set and forget” device. A simple monthly check is often all it takes to make sure it will operate when someone’s life depends on it.

1. Check the Indicator Light

Most AEDs have a clear status indicator on the front of the unit.

A green flashing light generally means the device is ready for use.
A red light, no light, or an audible beep means attention is required.

If the unit is alerting, the cause is usually one of the following:

• Low battery

• Pads expired or not properly connected

• An internal fault identified during self-testing

Warning lights and beeps should never be ignored. If the unit is not showing ready status, it should be checked immediately.

2. Log the Battery Installation Date

When inserting a new battery, write the installation date directly on the battery and record it in your equipment register. This small step makes future checks straightforward.

Most AED batteries have a lifespan of approximately four to five years. However, that lifespan can be shortened significantly in very hot or very cold environments. Lithium batteries are particularly sensitive to temperature extremes, which means devices stored in boats, vehicles, workshops, sheds, or outdoor facilities may experience reduced battery life even if the AED has never been used.

If you are unsure when a battery was installed, replacement is usually the safest option.

Some models, such as Philips HeartStart AEDs, display a manufacture date or install-by date rather than a simple expiry date. Tracking installation becomes especially important in these cases.

Models such as the iPAD SP1 and iPAD SPR perform regular automatic self-tests and typically use long-life lithium batteries designed for up to five years under normal conditions.

3. Understand Self-Testing

Most modern AEDs run automatic daily, weekly, and monthly self-checks.

Some units will also initiate a self-test cycle when the battery is removed and reinserted. This can be useful after replacing a battery or if you are clearing a fault notification.

After reinserting a battery, always confirm that:

• The green ready light returns

• There are no warning beeps

• Pads are properly connected

A Simple Monthly Check

Take 30 seconds each month to:

• Confirm the ready light is flashing green

• Check and record the battery installation date

• Check pad expiry dates

• Listen for any warning beeps

A ready AED protects your workplace, sports club, vessel, or community.

If you are unsure about your unit or need replacement batteries, the team at The Defib Store is always happy to help.