Do you know? If you have an alarm system regardless if you use it or not the batteries needs to be checked regually to avoide problems when you have a power cut. The battery within the alarm system has to be provide constant supply the event of the outage for the minimum of 12 hours. If the cells are old or not mainained or checked - replaced the intruder alarm system is usless and can go off. These power problems usually happening at nigth.