I live in a 7 yr old perssimon house just recently one if the smoke detectors has started bleeping as if the battery needs changing but I think the are wired up to the mains. I have tried to get the alarm off but can not see a battery compartment. Do any of you live in a similar house or experience same. The bloomin thing is bleeping day n night plus Ive two small kids and want the smoke detector working so they are safe. Thanks for any responses.