Marion County Fire Department just changed ours last week. No charge.
The detectors were giving the periodic "chirp" that indicates low battery life.
After the batteries were changed, one unit continued to beep. The fire fighters determined it was defective due to age.
They looked at the dates that all the units were manufactured and recommended that we replace all of them. It seems that after about seven years they can become unreliable. Ours were nine or ten years old. We changed them all.
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