Just take out the old battery and replace with a new one-no need to turn off the electricity. Do all the alarms at the same time or else expect to hear more chirping from other batteries within a couple of months.
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Taught physics and chemistry to teenagers for 37 years!! Started out in Rhinebeck,NY and ended up in Havre de Grace, MD-moved to Buttonwood full time and then moved to Labelle, but still go north to do some goose/deer hunting !!!!
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