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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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All my smoke detectors have a 'low-battery chirp' feature. That is they chirp once every few minutes when the batteries are low.
They all have a 'test' feature too. --the dog hates that one.
No need to replace perfectly good batteries.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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