Not sure if mine are "the best," but they have kept working on the same batteries for a year or so, thankfully they as yet haven't had to alarm us but no reason to think they wouldn't if they should.
FireAngel smoke detector, Lifesaver carbon monoxide detector.
I have fitted hundreds of Aico 10 year battery smoke alarms and carbon monoxide alarms and I think I have only had one fail, I have fitted a handfull of fireangel and had to replace 3, so for me Aico every time.
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