I have 4 line powered smoke detectors with battery backup. They are about 2 years old. Some time during the day one will beep once, then next day a different one will beep once.a different one will beep. Batteries are good. Any ideas ?
Check them all out. The problem should just be dust inside and out. Or, that a single backup battery is running low and the system is sounding a weakness within the group.
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