How Often Should I Change Battery In Smoke Detector. It might be easy enough to mark your calendar for one residential detector but businesses and large corporate buildings hold more detectors than a house. DFES recommends you change your battery on April 1st.
How often should I change the 9V backup battery in my Hard-Wired smoke detector. Smoke alarms powered by a 10 YEAR NON-REMOVABLE LITHIUM BATTERY do not require you to change the battery. Unless you have a 10-year battery life the NFPA recommends that you change your smoke detector batteries every six months.
Or consider a switch to a newer model of smoke alarm with a lithium-ion power source that lasts 10 years.
The recommended procedure is to check your smoke alarm batteries at least every month or every quarter of a year one to three months each year. As mentioned above these lithium battery alarms do not require the 9-volt battery to be replaced in each alarm every year. If your smoke alarms are powered by a nine-volt battery the battery should be replaced every 6 months while the alarm itself should be replaced once every 10 years. However for a hard-wired unit ie.
