Smoke detectors should be replaced after 10yrs of use.
Most smoke detectors work best with Duracell batteries. Our house is 4 months old and one of the detectors started flashing recently. I replaced the no name battery with a Duracell and problem solved.
Another option for the smoke detectors is to replace them with 10yr lithium battery backup style detectors. With these type detector there is no need to replace the batteries every year. When the detector reaches its end of life cycle it will let you know it is time to replace it.
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