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10-Year Battery Hardwired (with Battery Back-Up) Ionization Interconnected Smoke detector

First Alert 10-Year Battery Hardwired (with Battery Back-Up) Ionization Interconnected Smoke detector

4.7
620
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33 Questions
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what does 10 year battery backup mean? Battery lasts 10 years???


Lithium batteries have a long life, 10+ years. Smoke alarms must be replaced every 10 years because the detectors stop working due to the decay of the radioactive sample which is part of the detector, even though the electronics still work. These units thus need no battery replacements for the useful life of the unit.

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Yes, this unit features a 10-year sealed battery.

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