How Often To Replace Battery In Smoke Detector. Replace the batteries at least once every year. Your should install new batteries once a year.
All smoke detectors including hard wired units should be replaced every ten years. Your should install new batteries once a year. If the landlord is uncertain check the unit itself for date of manufacture.
If you hear your smoke detector making a chirping sound or see a blinking red light the smoke alarm is signaling you its time to replace the battery.
Test the alarm monthly. In addition most smoke detector manufacturers recommend that you replace the battery at least one time per year. According to the Australian standard 3786 an ideal smoke detector hard-wired with a good lithium battery should last 10 years. We can tell you that we replace our smoke detectors every five to seven years.
