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A self-contained residential smoke alarm lasts about 12 years, but must be replaced no later than 10 years for safety. Some units now have a 10-year battery life or other features that cannot be extended, thus requiring it to be discarded and replaced at 10 years.
Usually around 10 years, but you must test your alarm regularly because different quality smoke detectors last for different amounts of time.
It's recommended that a smoke detector alarm be replaced every 8-10 years. It is also helpful to write the date of purchase on your smoke detector alarm for future reference.
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