First, ensure that the battery is properly connected to the fire alarm system. Check for any loose connections or corrosion on the terminals. If the connections are secure, the issue might lie with the battery itself. Try performing a capacity test using a battery analyzer to determine if the battery can hold its rated capacity. If the battery fails the capacity test or shows signs of deterioration, it may need to be replaced. Additionally, consider factors such as ambient temperature and charging conditions, as extreme temperatures or incorrect charging methods can affect battery performance. If troubleshooting these factors doesn’t resolve the issue, it’s advisable to consult with a professional technician for further assistance.