If you replaced a battery in an alarm sensor but the Qolsys panel or Alarm.com still shows Low Battery, the warning may need time or normal sensor activity to update. There may also be a problem with the new battery, battery installation, sensor cover, or the sensor itself.
These instructions apply generally to sensors connected to:
Before doing anything else, check the exact sensor name displayed by the Qolsys panel or Alarm.com.
For example:
Make sure the battery you replaced belongs to the device actually reporting Low Battery.
A Panel Low Battery message refers to the Qolsys panel's backup battery.
A sensor Low Battery message refers to an individual device.
Replacing a door or window sensor battery will not clear a Panel Low Battery condition.
Different sensors use different batteries.
Do not assume that two sensors that look similar use the same battery.
Use the battery type specified for the exact sensor model.
If you are unsure which battery is required, contact CommTech Systems with the sensor model or a description of the device.
Make sure the new battery was installed in the correct direction.
Look for the positive and negative markings inside the sensor.
A battery installed backward may prevent the sensor from operating.
Check that the battery is making proper contact with the battery terminals.
A battery that is not completely seated can cause:
Do not bend or modify the battery contacts.
A replacement battery can occasionally be weak even if it is new.
Use a fresh, good-quality battery of the correct type.
Avoid using a battery that has been stored for an unknown period.
If the device uses multiple batteries and the manufacturer specifies replacing them as a set, replace the complete set.
Do not mix:
After replacing the battery, make sure the sensor cover is completely closed.
An improperly installed cover may create a Tamper condition.
If the panel now shows Tamper instead of Low Battery, check the sensor cover.
A Low Battery warning may not disappear immediately after battery replacement.
Allow the sensor and system time to communicate normally.
Do not repeatedly remove and reinstall the battery trying to force the warning to clear.
For a door or window sensor, opening and closing the protected opening may allow the system to receive updated sensor activity.
With the system Disarmed:
This also helps confirm that the sensor is communicating.
If the sensor does not change between Open and Closed after the battery replacement, check:
If it still does not respond, contact CommTech Systems.
Wireless motion detectors may conserve battery power by limiting how frequently they report activity.
Do not repeatedly walk in front of the motion detector and assume it has failed because it does not immediately respond every time.
Allow the device time to resume normal operation.
If Low Battery remains, contact CommTech Systems.
Do not attempt to clear or test a glass-break detector by:
If the Low Battery condition remains after replacing the correct battery, contact CommTech Systems.
Smoke detectors are life-safety devices.
Use only the correct battery and approved testing method for the specific detector.
Do not use actual smoke, flame, or other unsafe methods to test the detector.
If the Low Battery condition remains, contact CommTech Systems.
Carbon monoxide detectors are life-safety devices.
If the detector continues reporting a battery or trouble condition after the correct battery has been installed, contact CommTech Systems.
Do not ignore recurring CO detector trouble.
Environmental sensors may not update in exactly the same way as door and window sensors.
After installing the correct battery, make sure the sensor is properly assembled and allow time for the system to update.
Contact CommTech Systems if the warning remains.
If Low Battery clears but the panel now reports Tamper, the sensor cover may not be installed correctly.
Check that the cover is completely closed.
Do not tape the sensor closed as a permanent repair.
If the panel now reports Malfunction or Not Responding, the sensor may not be communicating.
Check:
If the problem remains, contact CommTech Systems.
If the Qolsys panel no longer shows Low Battery but Alarm.com still does:
If Alarm.com continues showing Low Battery while the panel does not, contact CommTech Systems.
Use the physical Qolsys panel as the primary indication of the sensor's current local condition.
If the panel continues reporting Low Battery after the correct battery has been replaced, contact CommTech Systems.
If the warning disappears but returns shortly afterward, possible causes can include:
Contact CommTech Systems if the warning repeatedly returns.
A sensor should not require unusually frequent battery replacement under normal conditions.
If the same sensor repeatedly reports Low Battery much sooner than expected, contact CommTech Systems.
Do not continue replacing batteries without investigating the cause.
If the sensor worked before the battery change but does not work afterward:
If the device remains unresponsive, contact CommTech Systems.
Do not scrape, bend, or modify damaged battery contacts.
If you see corrosion, leakage, or physical damage, stop and contact CommTech Systems.
Avoid touching material from a leaking battery.
If the sensor housing, cover, battery holder, or other part was damaged during battery replacement, do not attempt to glue or permanently modify it.
Contact CommTech Systems.
Removing a sensor from the system is not an appropriate way to clear a Low Battery message.
If a new battery does not correct the problem, the sensor should be diagnosed.
A persistent Low Battery condition does not require factory resetting the Qolsys panel.
Do not reset connected equipment in an attempt to clear the warning.
Contact CommTech Systems if:
When requesting assistance, provide:
For your security, do not provide alarm codes, passwords, or other private account credentials through the support chatbot.