May 1, 20206 yr comment_16944 I have two mbx660 mains powered smoke detectors and recently I experienced chirping which I discovered was related to back up battery which I replaced. All good. The other smoke detector has now had the same problem however when I change the battery the alarm goes off and only stops when I remove the battery. Can you advise what the issue may be? Report
May 3, 20206 yr comment_16947 Hi, could it be that the alarms are older than 10 years? In which case they might require replacing. Harry Report
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