Quote:
Originally Posted by Ecuadog
Bingo.
I installed nine Energizer Ultimate Lithium (10 yr) batteries in 12/2016 and made a note in my Google calendar to replace them all in 12/2026. So far, only two have failed earlier than expected. One in 11/2021 and one in 10/2023.
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Note that the newer smoke alarms will not even allow you to use the detector after 10 years. They have a built-in timer and the device starts to beep until you replace the detector.