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FYI - The 9V Lithium batteries last that long. https://www.amazon.com/Energizer-LA522SBP-Lithium-Battery-Detectors/dp/B003VKOEBM https://www.amazon.com/Energiz

• deleted 7y ago
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• tempestn 7y ago
  Good to know! We bought a few with integrated 10-year batteries from Home Depot a few years back, but I didn't realize you could get regular lithium 9Vs that last that long in a smoke detector now.
  • moftz 7y ago
    You should replace the smoke detector after 10 years anyway so buying the disposable ones is probably safer.
    • NikkiA 7y ago
      !! even the hard-wired ones are supposed to be replaced after 10 years, and new hard-wired ones will automatically brick themselves after the 10 years is up !!
      • tempestn 7y ago
        For anyone reading this wondering how that's safe, I believe they make noise regularly once they reach this state, to encourage you to replace them, rather than just silently failing to operate!
        • NikkiA 7y ago
          Yep, blip every 30 seconds for 6 weeks, until they go silent. It'll drive you nuts, especially if your handy builder put them in out-of-reach places.