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Not XKCD - Smoke detector batteries
(lemmy.world)
A community for a webcomic of romance, sarcasm, math, and language.
Voltages drop in the cold, and the middle of the night is usually the coldest. So that's why this is probably not far from reality.
Wouldn’t the lower temperature make it highly likely that the low power beep occurs only during the middle of the night, but not during the day?