Beeping smoke detector (already chaned batteries)
One of our smoke detectors started beeping a couple of weeks ago. I changed the battery and it started beeping again! So, I changed the battery again. About a week later it is beepng again! I believe te detectors are hard wired with the battery for back up (not totally sure of this though.). Are there an suggestions as to why the batteries are running down? Both times I replaced using brand new batteries.