Smoke Detector unit gone bad or not?

 So did all the detectors start roaring all at the same time?  Then you went through changing out all the old batteries for them to all start sounding off again about an hour later?  So you know that the batteries are not the problem.  But how to determine which smoke detector has gone bad causing all of them to sound off?

Well, for the Kidde Ionization Smoke Alarm Model i12060, you can put the battery in position, but leave it disconnected from the wiring.  Within an hour or possibly 30 minutes, if the detector unit is bad, it will sound off by itself just by having it sitting aside.  After identifying the bad units, replace them by going to a home improvement store like Lowe's or Home Depot.  Keep your home safe!