Guest Brian McHugh Posted March 27 Report Share Posted March 27 We have a house built approx 1999 with wired interlinked smoke detectors. These have 9v batteries which are replaced regularly. I believe that if either alarm senses smoke, both are activated. Do these alarms have a fixed lifespan or are they still ok if they seem to test ok ? Quote Link to comment Share on other sites More sharing options...
green-foam Posted April 3 Report Share Posted April 3 All smoke alarms should have an expiry date printed on them. The average life span for a smoke alarm is 10 years. Personally, I would not be worried if I changed the smoke alarm by year 11, but I would say 25 years is too long. Quote Link to comment Share on other sites More sharing options...
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