Turn th eunit counter clockwise to remove from ceiling. Then depress the two sides of the plug in order to remove plug from unit. The battery cover then gently lifts from the outside in. Use only 1 9 volt alkaline battery replace ebery 2 years
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Same ISsue even after replacing battery
The fire alarms were chirping low battery every minute. I changed all the batteries, but still the units keep chirping... Any idea?