Is it that the Americium is decaying to the point that it won't work anymore??That is my understanding. Worse than not work at all, it may or may not work, making it harder to know if you have a problem if you don't know about the deterioration. I was shocked to find this out when I researched smoke detectors when ours went haywire after 15 years. Batteries were checked regularly and all looked to be in good shape, but we had been relatively unprotected for about 5 years.I am amazed that there is not more public service announcements bringing this gradual decay issue to the attention of homeowners. Lord knows they hammer home the battery issue.IP
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