The SJFD agrees with the National Fire Protection Association (NFPA) advising residents to change batteries in smoke detectors every six months to maintain reliable operation, even if the low-battery warning has not sounded.
A practical way to remember this is to replace batteries when you adjust clocks for Daylight Saving Time in the spring and fall. For smoke alarms with 10-year lithium batteries, the battering is built-in, and the entire alarm should be replaced after 10 years from the manufacture date.
Signs you Need a Battery Change
Most smoke detectors emit a high-pitched chirping sound when the battery is low. This warning typically occurs one every 30 to 60 seconds and can last for a least seven days, giving you time to replace the battery before it fails completely. Waiting for the chirp is reactive; proactive replacement every six months is safter.
Testing and Maintenance
· Test alarms monthly using the test button to ensure the battery and sensor are functioning properly.
· Replace batteries in all alarms simultaneously to maintain consistent protection throughout your home.
· Dust and clean alarms regularly to prevent false readings or reduced sensitivity.
Special Considerations
· Hardwired alarms with battery backup should have their backup batteries replaced at least every six months, and the entire unit replaced every 10 years.
· 10-year lithium-powered alarms do not require battery changes; replace the entire alarm after 10 years.
By following this schedule and testing routine, you ensure that your smoke detectors remain fully operational, providing continuous protection for your home and family.