How Often Change Smoke Alarm Battery. For hardwired smoke alarms that only use battery power as a backup in case of power outages its best to replace the batteries on an annual basis. At First Alert we offer 10-year smoke alarms that have a built-in 10-year battery which eliminates the need for battery replacements for the life of the detectors.
Some states dont allow any type of battery to be thrown in the trash so check your city or states rules. Making a schedule is the easiest way to keep up with your smoke detector batteries. Most manufacturers of smoke detectors recommend that you replace the battery at least one time per year.
It might seem like too much but what many people dont realize is that smoke detectors run 247.
How often should you replace the batteries in your smoke detector. You will need to replace Nest Protect after 7 years with a brand new Nest Protect. Replace the new battery in the detector and plug. Rather replace the entire alarm after 10 years.
