Qolsys IQ Panel 2 4 and 5 - Sensor Low Battery and Battery Replacement

If your Qolsys panel reports a sensor low battery, the first step is to determine exactly which sensor is reporting the problem.

The battery is determined by the sensor model, not by whether you have an IQ Panel 2, IQ Panel 4, or IQ Panel 5.

Do not purchase a battery until you have identified the affected sensor.

Identify the Sensor With the Low Battery

Read the message displayed by the Qolsys panel.

It may identify a sensor by a name such as:

• Front Door
• Back Door
• Kitchen Window
• Living Room Motion
• Basement Glass Break
• Garage Door
• Hall Smoke Detector

Write down the exact sensor name.

If necessary, check the panel's Message Center for the low-battery alert.

Panel Battery Versus Sensor Battery

These are two different problems.

Sensor Low Battery means a wireless device enrolled into the security system is reporting a weak battery.

Panel Low Battery refers to the backup battery inside the Qolsys alarm panel.

If the message specifically says Panel Low Battery, do not assume a door or window sensor needs a battery.

Identify the Sensor Before Buying a Battery

Qolsys systems can use many different wireless sensors, and different sensors use different batteries.

Depending on the equipment installed, a sensor could use batteries such as:

• Coin-cell batteries
• CR123A lithium batteries
• AA batteries
• AAA batteries
• Other battery types

Do not select a replacement battery based only on the sensor's location or description.

For example, two different door sensors may use completely different batteries.

If You Do Not Know the Sensor Model

If you know which sensor has the low battery but do not know its model, look at the physical sensor.

A model number may be printed:

• On the sensor
• On the back
• Inside the sensor cover
• On an equipment label

Do not remove the sensor from the wall or door unnecessarily.

If you cannot identify it, contact CommTech Systems or provide a clear photo of the sensor so the correct model and battery can be identified.

Before Replacing the Battery

Before opening the sensor:

1. Make sure there is no active alarm.
2. Disarm the security system.
3. Confirm that you have identified the correct sensor.
4. Obtain the correct replacement battery.

Opening a wireless sensor may temporarily create a tamper condition on the Qolsys panel.

This is normal for many sensors because opening the cover activates the device's tamper switch.

Replace the Battery

The exact procedure depends on the sensor model.

Generally:

1. Disarm the alarm system.
2. Carefully open the sensor using the proper method for that model.
3. Note the position and polarity of the existing battery.
4. Remove the old battery.
5. Install the correct new battery.
6. Make sure the battery polarity is correct.
7. Reinstall the sensor cover completely.
8. Verify that the cover is properly seated.

Do not force the sensor cover. Some sensors use clips, tabs, screws, or specific opening points.

Check the Panel After Replacement

After replacing the battery:

1. Check the Qolsys panel.
2. Make sure the sensor is no longer showing a tamper condition.
3. Open and close the protected door or window if appropriate.
4. Verify that the panel recognizes the sensor changing state.
5. Allow time for the low-battery condition to update.

A low-battery message may not disappear instantly after the battery is replaced.

Tamper Appears After Battery Replacement

If the panel reports a tamper after replacing the battery, check the sensor cover.

Make sure:

• The cover is fully closed.
• All tabs or clips are seated.
• The cover is not crooked.
• Nothing is preventing the tamper switch from closing.

If the cover appears correct but the tamper remains, contact CommTech Systems.

Sensor Still Shows Low Battery

If the low-battery warning remains:

1. Verify that the replacement battery is new.
2. Verify that it is the correct battery type.
3. Check battery polarity.
4. Make sure the battery is fully seated.
5. Verify that the sensor cover is properly installed.
6. Activate the sensor once if appropriate.
7. Allow the system time to receive an updated battery status.

If the warning continues, the sensor may require additional troubleshooting.

Sensor Stops Working After Battery Replacement

If the sensor worked before the battery replacement but does not work afterward:

1. Verify battery polarity.
2. Verify the correct battery was installed.
3. Check that the battery is making proper contact.
4. Check the sensor cover.
5. Test the sensor by opening and closing the protected door or window if appropriate.

Do not delete the sensor from the Qolsys panel.

Removing a sensor from programming is not a normal battery-replacement step.

Door or Window Sensor

After replacing a door or window sensor battery:

1. Close the door or window.
2. Check that the panel shows the sensor closed.
3. Open the door or window.
4. Verify that the panel shows the sensor open.
5. Close it again and verify that it returns to closed.

If it remains open while the door or window is physically closed, there may be a sensor, magnet, alignment, or communication problem.

Motion Detector

After replacing a motion-detector battery, the detector may have a temporary sleep or reset period depending on the model.

Do not assume the motion detector has failed simply because it does not immediately respond to repeated movement.

The correct testing procedure depends on the motion-detector model.

Glass Break Detector

Glass-break detectors should be tested using the appropriate procedure and equipment for the specific detector.

Do not strike or break glass to test a glass-break detector.

Smoke and Carbon Monoxide Detectors

Use additional caution with smoke, carbon monoxide, heat, and other life-safety devices.

Do not remove the battery from a life-safety device and leave the device without a functioning replacement.

Use the battery specified for the exact detector model.

If you are unsure about the correct battery or replacement procedure, contact CommTech Systems.

Do Not Delete or Relearn the Sensor

A low-battery condition normally does not require the sensor to be deleted, re-enrolled, or relearned into the Qolsys panel.

Do not delete a working sensor from system programming simply because its battery is low.

Do Not Factory Reset Anything

Do not factory reset the:

• Qolsys panel
• Sensor
• Alarm.com account
• Other security equipment

to correct a normal sensor low-battery condition.

When to Contact CommTech Systems

Contact CommTech Systems if:

• You cannot identify which sensor has the low battery.
• You do not know which battery the sensor requires.
• You cannot safely open the sensor.
• The low-battery warning remains after installing the correct new battery.
• The sensor reports a tamper that will not clear.
• The sensor stops working after battery replacement.
• The panel no longer recognizes the sensor.
• The problem involves a smoke, carbon monoxide, heat, or other life-safety device.
• The sensor appears physically damaged.

When requesting assistance, provide:

• Your Qolsys panel model if known
• The exact sensor name shown on the panel
• The sensor model if available
• A clear photo of the sensor if you cannot identify it
• The exact message displayed by the panel

Do not provide your alarm code, Master Code, Installer Code, or Alarm.com password.