[villagetinker]

I do not know which brand of detectors you have, but as I recall I needed to do a system reset after replacing the batteries. There are a few possibilities, one or more of the detectors is faulty, I do recall there was a recall for smoke detectors recently you should be able to search the government recall website. You may have a faulty battery causing the alarms. When you replaced all the alarms did you use the same make/model, and are you sure the interconnected wiring was connected properly? If you did a mix and match on the detectors this could be causing the problem. Also, if you are not the original owner, look for a detector in the attic, this recently happened to a friend of mine.