In alt.home.repair, on Mon, 30 Nov 2020 16:03:53 +0000 (UTC), AJL
wrote:


I bought detectors with 10 year permanent batteries installed. When the
batteries finally complain or the 10 years is up I'll replace them with
another ten year bunch. Unless of course they outlive me.

I think they sell ones with 6-year batteries for 104-year olds.