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How To Change The Batteries In A Fire Alarm. With the battery fully charged and connected to the charger measure the voltage across the battery with a voltmeter. The NFPA Code indicates when to replace the batteries but the NFPA Code only indicates the worst case scenario.
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The NFPA Code indicates when to replace the batteries but the NFPA Code only indicates the worst case scenario. Install the battery back in the smoke detector. Replacement Battery Types Most detectors take AA or 9V batteries.
Install the battery back in the smoke detector.
Every home should have at least two smoke alarms and more if possible depending on the size of the house and the number of rooms. Most smoke detectors use 9V batteries. Since this is an indispensable means of protection make sure that your home has an adequate number of smoke alarms installed. Batteries should be replaced long before that.
