Firstly, ensure the battery connections are clean and tight. Loose connections can cause voltage drops and affect performance. Check the battery voltage with a multimeter to ensure it’s within the specified range (around 12.8 to 13.2 volts for a fully charged 12V battery). If the voltage is significantly lower, it might indicate a charging issue or a faulty battery cell.
Inspect the battery casing for any signs of swelling or damage, which could indicate internal problems. Additionally, verify the integrity of the battery terminals and cables for any corrosion or damage.
If the battery seems to be in good condition physically and electrically, the issue might lie elsewhere in the fire alarm system. Consult the system manual for troubleshooting steps related to battery backup. It’s also advisable to contact a certified technician for further assistance if the problem persists.