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
Are you wondering “How often to replace battery in hard wired smoke detector?” We’ve got some answers for how long batteries last in hard-wired smoke detectors and how often to replace batteries in battery smoke-detectors.
Growing up, I was always taught to change your smoke detector battery with the time change. But that was for battery powered units-surely a backup battery in a hard-wired unit would last longer. The units chirp when the backup battery is low. That should be good enough right?
Our Wake Up Call for Wired Smoke Detector Battery Replacement
It was a stormy night and we lost power – first for a minute, then a 30 second return, followed by an hours long outage. As soon as the power went out a second time, our smoke/carbon monoxide detectors started sounding a carbon monoxide warning.
While I was 90% sure that it was a false alarm because of the timing, we still had the fire department perform a check. When I called (the non-emergency number), I was told that the fire department was already on the way to my neighborhood to respond to other alarms that started with the power outage.
The fire department confirmed that no carbon monoxide was present near our detectors. They advised that our carbon monoxide detector going off after power outage was probably caused by a low battery. Yes, even though our hard-wired units were not chirping the batteries were low. They recommended that we change the batteries.
Sure enough once all 3 CO/Smoke detectors had new batteries the alarm stopped sounding. Upon replacing the batteries, we realized that they had not been changed since we installed new units 2.5 years earlier.
Continuing Issues
Of course our smoke alarm saga was not over. A couple of hours later when the power resumed, we started hearing the low battery chirp from a smoke detector. Unfortunately, we started the day with only 6 9V batteries in a house with 3 combination smoke/CO detectors and 6 smoke detectors. After a quick run to the store, we managed to quiet the alarms and everything seemed to be working properly.
And the saga still did not end, two nights later the smoke alarm low battery chirping sound started again. All I could think was “Why is my hardwired smoke detector chirping again?”
My best guess is that the 9V batteries that we used for replacement had been in our basement for awhile. While they had not yet expired, clearly they were not providing enough charge for the detectors. Neither of us wanted to make a late night run for batteries, so we lived with it for the night.
We Were Not Alone
We were not alone in having smoke detectors sound with a power loss. My daughter and I both told other people about our experience with the carbon monoxide alarm sound. We both had people say that their smoke detectors alarmed when they lost power this week. Clearly this is not an isolated incident.
How Often Should You Change Smoke Detector Batteries
Note, I am not a fire professional, and these are my opinions only for when to change battery in smoke detectors hard-wired and battery based.
Electric Detectors
If you have a battery backup in your electric detector, my non-professional opinion is that they do not need to be replaced every 6 months. But, 2.5 years is too long to wait for replacement with alkaline batteries. I would suggest replacing the batteries yearly with alkaline batteries and after any extended outages.
We have switched to replacing our smoke detector battery with a long-lasting Lithium battery. They are designed to have a longer lifespan and are recommended for smoke detectors.
Disclosure: Links below may be affiliate links. Ann Arbor with Kids receives a commission on sales. We appreciate your support by shopping through our links.
Battery Operated Smoke Detectors
Replace batteries in battery operated detectors twice a year. Traditionally, it was recommended when the clocks change. With the lengthening of Daylight Saving Time, the time changes are no longer close to equal (8 vs 4 months). Instead, we suggest picking 2 other events and replacing them then. For example, New Years and Fourth of July are 6 months apart.
Of course with smartphones, it is even easier. Change anytime and put a 6 month reminder in your phone!
Or, switch to battery operated detectors that come with a 10-year battery life. Since smoke detectors have a 10 year life, this is a great option for new units.
Disclosure: Links below may be affiliate links. Ann Arbor with Kids receives a commission on sales. We appreciate your support by shopping through our links.
Replace Smoke Detectors Every 10 Years
Smoke detectors have a finite life. They should be replaced every 10 years. I shared our experience with the smoke detectors not working after 11 years. We had filled the house with smoke after a cooking incident and our alarms did not work.
