Isn't it something that the battery failure usually starts at night? I have been using Duracell Batteries and lately (Red Colored Quantum Batteries) most of my life with no problems but the last two batches from Lowes on 441 have failed very quickly in the Smoke Alarm/ Carbon Monoxide Detectors. I still stuck to Duracell but went back to the Gold & Black Color batteries.
I added 3 Fresh/New units after I bought the Gas Powered Generator. Better safe than sorry.
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