Expert Guide: Change Battery in Smoke Detector

by Danielle
a person changing battery of a smoke detector holding a screwdriver

And who doesn’t want a safer home? One makes sure to be safe in his own house and installing a smoke detector is one of the ways. It’s the superhero that can help you catch the fire signals faster by the sounds it makes. However, as good as it is for safety, it can be a real headache if the battery needs to be changed. Now, you might be thinking how do we know if the battery needs to be changed? SIMPLE! Your detector is going to make unstoppable chirping sounds and the green light turns red, it’s your sign to change the old battery in the smoke detector. So, in this article guide, we are going to help you with that. Follow the tips and steps mentioned below to effectively change the battery of the smoke detector into a new one.

Horizontal photo of female hands taking home smoke detector apart with white ceiling background

Common Batteries Used in Smoke Detectors

Before we move on to the guide to changing the batteries in a smoke detector, let’s talk about common batteries used in them.

  • 9-volt batteries: Among the most often used battery types in smoke detectors are 9-volt batteries. They are a common option for home smoke alarms since they are reasonably priced and widely available.
  • Lithium batteries: When compared to ordinary alkaline batteries, lithium batteries last longer. They work well for smoke detectors in places that are hard to reach or places where it is inconvenient to replace batteries often because of their track record for longevity and ability to supply steady power over a long time.
  • AA batteries: Certain smoke detectors, especially the more recent models or those made especially for specific applications, may take AA batteries. These easily accessible, multi-type batteries alkaline, rechargeable, and lithium-ion offer performance and cost versatility.
  • Sealed rechargeable batteries: Some smoke detectors include sealed rechargeable batteries that are meant to endure the detector’s entire lifespan. Usually seen in more recent, upscale smoke alarm models, these batteries do away with the necessity for routine battery changes.
  • 10-year sealed batteries: Smoke detectors with integrated 10-year sealed batteries have grown in popularity recently. Because they are non-replaceable and made to withstand the duration of the life of the smoke detector, these batteries offer hassle-free maintenance and lasting dependability.

a person inserting a new battery in a smoke detector


Steps to Change Battery in a Smoke Detector

If your detector has started giving you alarms, it means it’s time to change and replace it with a new one. If you are wondering how to change the battery in a smoke detector, look no further as we are here to help you.

You can also have a look at button battery sizes for detailed information.

1: Prepare Everything to Change Battery in Smoke Detector

The first step in how to change batteries in a smoke detector is to prepare everything. It’s critical to gather all the tools and supplies needed before starting the battery replacement procedure. Choose a solid ladder first that will comfortably reach the height of your smoke detector. Make sure it won’t wobble while used and is on a level surface.

Then get the proper replacement battery for your smoke detector. Lithium or 9-volt batteries are used by most home smoke detectors, but be sure the right kind is indicated in the specs. Finally, have ready a little container to dispose of the old battery securely. Sealable to stop leaks, this container should be set aside for hazardous trash.

2. Keep Safety First to Change Battery in the Smoke Detector

Dealing with electrical equipment should always put safety first. For protection against electrical shocks or problems, the smoke detector must have its power supply turned off before being handled. If you want to do this, either locate the circuit breaker that regulates power to the detector and turn it off, or remove the current batteries from the detector. But if you’re not sure how to manage electrical services, think about seeking expert help. Following this step will make sure that you are safe while changing batteries in smoke detectors.

3. Access the Detector

The detector can be accessed as follows: Accessing the smoke detector is possible after making sure the power is off. Lean the ladder firmly under the detector and slowly climb. The mounting brackets of most smoke detectors are made to be easily removed for maintenance. Depending on the model, you could have to slip the detector off the bracket or twist it counterclockwise. Applying too much force could break the detector or the wall around it. While reaching wired smoke detectors could need extra care, the procedure is usually simple.

4. Remove the Old Battery and Change Battery in Smoke Detector

Track down the battery compartment after removing the smoke detector from its mounting bracket. Usually, the detector has this on the underside or rear. You might have to slide a cover or press a release latch on some models in order to get at the battery. Once open, carefully take the old battery out of its place. Watch the battery’s arrangement and any wiring connections that it might have. This is the foundational step when figuring out how to change the battery in the smoke detector’s first alert.

5. Dispose Old Battery

Cleaning the environment requires proper disposal of the old battery. Stow the old battery in the hazardous waste receptacle provided. Checking with your local waste management authority for appropriate disposal processes is advised because many towns have particular rules for disposing of batteries. Old batteries are also frequently accepted for safe disposal by recycling facilities.

6. Insert the New Battery

Check that the polarity of the new battery fits the connections in the battery box before inserting it. Positive (+) and negative (-) terminals of most batteries are marked. To be sure the battery compartment is positioned correctly, match these markings with those within. Once aligned correctly, carefully slide the new battery into the compartment, being sure it fits tightly and makes excellent contact with the terminals.

7. Test the Detector

It’s time to check if the smoke detector is working properly after installing the new battery. Either by turning the circuit breaker back on or by replacing the batteries, the detector will have power restored. The detector’s alert will ring when you push the test button after it is powered on. To be sure the detector is functioning properly, listen to the alarm sound. If the alarm does not go off, verify the battery installation and connections one more.

8: Reinstall the Detector

The smoke detector should be reconnected to its mounting bracket after it has been verified to be operating properly. When the detector and bracket are properly aligned, slip or twist it into position until it clicks. To keep the detector from inadvertently moving, make sure it is tightly set on the bracket.

9. Reset If Important

Sometimes the smoke detector can keep beeping long after the battery has been changed. This may suggest the detector has to be reset. Hold the test button down for ten to fifteen seconds to reset the detector. This ought to clear any false alarms or fault indicators and get the detector back to normal.

10: Regular Maintenance

The last step in changing the hardwired smoke detector battery is regular maintenance. For continued reliability, a routine maintenance schedule must be set as soon as the smoke detector is back in place and operating as it should. Every six months, test each smoke detector in the home to be sure it’s working properly. To retain the best performance, consider changing the batteries once a year, even if they haven’t reached the end of their lifespan.

You can also check out further details of each step in this article.


Summing it up, the article covered important points to follow when changing the battery in the smoke detector. It is known that the battery wears out after some time and its performance is compromised. So, all you have to do is follow our article guide and renew your detector.

Prioritize Your Safety!

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