Gotta commend Duracell for their quality control. Two smoke detectors had their 9 Volt battery backups do their low power warning beeps within 20 mins of each other. I reckon we changed them both about a year ago at 1am also. Ha!
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Why is is always in the middle of the night?
Also...why are they not powered with battery back up
Have one of those, went bad so at it just went off and wouldn't stop until I had to cut the wires!
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