Have you ever noticed when there is a power cut numerous burglar alarms start sounding? When the power goes out the battery cuts in just in case someone has cut the power to the premises to disable the alarm. As soon as the power is restored the alarm resets and no problem
The reason that alarms ring when there has been a power outage is normally because the battery is no longer working. The design life on these batteries is 5 years County Battery Services Ltd recommend they are replaced every 3 years although offer full testing services in any of their stores in Kirkby in Ashfield, Nuthall, or Ilkeston.