this post was submitted on 30 Jul 2024
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I shall counter with a hypothesis:
It could be that extended lower temperatures at night slow battery chemistry to the point where the voltage sags below the trigger threshold. It would take quite a few hours to cool the battery down from day time ceiling temps, so this would naturally occur in the early hours of the morning just before temperatures rise again.
oh come on, we are talking about detectors inside heated apartments, not an igloo.
edit: ok, but now i am curious. it seems that other people share the same theory, but that doesn't mean it is not just shared myth.
https://www.google.com/search?q=fire+detectors+battery+dead+time+of+day
if anyone has some research or link they consider interesting on the topic, i'd be happy to look at it.