how does one know a detector has to be replaced?
Homes that have hard wired detectors are "usually" wired such when one goes off they all go off.....makes sense from a safety perspective.
When a battery goes bad, only the affected unit will beep. It has been noted and observed that for some reason, Energizer 9 volt batteries work better in most detectors than any other brand. In fact some detectors just will not work with certain brand batteries.
I assume everyone knows that some detectors with a new battery will continue to "chirp" until the internal electronics resets.
One way for sure to not have them go off during the night is to replace the battery every year when daylight savings time goes into effect....whether the unit is chirping or not. If you wait for the battery to go bad you will be awakened at some point. You will definitely be playing the game of which one was it!!!!
btk
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