Many newer model smoke detectors are powered by 10-year batteries and, by design, must be discarded after 10 years. In some homes, smoke detectors are powered by the home’s electricity and have a removable, back up battery for use during power outages. If you have this type, replace your back up battery twice a year to ensure you will have the protection you need in the event of a fire.
Smoke detectors are worthless if they aren’t powered. If you have older model smoke detectors in your home, they may rely exclusively on batteries for power (usually a 9-volt). If this is the case, use the beginning of Daylight Savings Time (DST) as a reminder to replace your smoke detector batteries with fresh ones. This year, DST begins March 11.