Batteries in your smoke and carbon monoxide detectors should be changed at least once a year. A good rule of thumb is to change them twice a year, during daylight savings.
Facts and figures about smoke alarms
- In 2009-2013, smoke alarms sounded in more than half (53%) of the home fires reported to U.S. fire departments.
- Three of every five home fire deaths resulted from fires in homes with no smoke alarms (38%) or no working smoke alarms (21%).
- No smoke alarms were present in almost two out of every five (38%) home fire deaths.
- The death rate per 100 reported home fires was more than twice as high in homes that did not have any working smoke alarms compared to the rate in homes with working smoke alarms (1.18 deaths vs. 0.53 deaths per 100 fires).
- In fires in which the smoke alarms were present but did not operate, almost half (46%) of the smoke alarms had missing or disconnected batteries.
- Dead batteries caused one-quarter (24%) of the smoke alarm failures.
The above facts were obtained from the NFPA website.