9V Batteries for smoke alarms

• Which AA batteries are best for smoke detectors?

  

  May 07, 2025

  Almost three in five fire deaths are caused by house fires where smoke alarms are not installed or where the smoke alarms are not working properly. To keep you and your family safe, it is vital to have functioning smoke alarms and the right batteries. The battery in your smoke alarm should be one you can trust. That’s why WARRIORS recommends that you upgrade to a 10-year sealed battery smoke alarm. 9V battery vs. AA batteries For many years, the 9V battery has been the battery of choice for smoke alarms. However, today, a more common smoke alarm battery is two or three AA batteries. AA batteries have about three times the energy of 9V batteries. When using these batteries in fire detectors, it is important to regularly inspect the detectors and replace the smoke alarm batteries every 6 months. 10 Year Sealed Battery Smoke Alarm Some areas require the installation of 10-year sealed battery smoke detectors. Even if your area does not mandate the installation of such detectors, WARRIORS strongly recommends them. The batteries in 10-year sealed battery detectors last as long as the detector, and there is no need to replace the batteries. These fire detectors also come with a battery life warning to remind you to replace the detector after 10 years. Buy 10 Year Sealed Battery Smoke Alarms Choose the choice that gives you and your family the greatest peace of mind. WARRIORS is committed to creating reliable products to protect your home and family. Learn more about our 10-year sealed battery sirens.   Replacing 9V Batteries for smoke alarms   1. Check the battery type. Make sure you always use the correct battery type and install the battery correctly to ensure the detector will work properly. • Detectors using lithium batteries will last for ten years. Typically, the battery cannot be replaced, but the entire detector is replaced at the end of its ten-year life. • Many detectors will use 9-volt batteries. However, some may require a different type of battery. • Use high-quality, long-lasting batteries. Using rechargeable batteries or low-quality batteries may cause your smoke alarm to fail.     2. Remove the smoke detector. You will need to remove the smoke detector from the ceiling. If your detector is hardwired to the home's electrical system, you should first disconnect the power at the fuse box. • The method for removing a smoke alarm will vary depending on the model. • Most smoke detectors are removed by twisting or sliding the detector out of its mounting position. • Some detectors do not require you to remove the entire detector. These models only require you to remove the portion that covers the internal components and battery. • Not all hardwired smoke detectors come with a backup battery.     3. Open the battery compartment and install the new battery. To access the battery, you must remove the cover that contains the battery. The exact location of the battery and how it is secured varies from model to model. Usually, once you remove the detector's cover, you can easily see where the battery is. • The location of this cover will vary from model to model, and some may be secured by screws or other fasteners. • Most caps will slide off the body of the smoke detector and move away. • Once open, you can remove the old battery. • Make sure you install the new battery correctly. Check that the negative and positive connections match the labels on the smoke alarm • Replace the battery cover. • If you have trouble finding or removing the battery from your smoke detector, consult your smoke detector's manual. If you don't have a physical copy of the manual, you may be able to find it online on the manufacturer's website.     4. Test the battery. Locate and test the battery using the button on the smoke alarm. • The location of the test button varies. • Most test buttons require you to hold the button down for a few seconds to begin the test. • If successful, the alarm will sound.     5. If the test fails, check again. Only reinstall the smoke alarm after it has passed this battery test and proven to be working properly. • Check that the batteries are installed correctly. Make sure the positive and negative poles match the correct terminals in the smoke detector. • If the batteries are installed correctly but the test fails, replace the batteries and try the test again with new batteries. • If the new batteries don't work, your detector may need to be replaced. You can contact the manufacturer and they may be able to replace it for you if the detector is under warranty. • Some alarms have an LED light that indicates whether the alarm is working properly. Typically, a green light means the alarm is working properly and a red light means there is a problem.     6. Check your smoke alarm's instruction manual. • Finding the location of the batteries and how to access them may vary by model. • The manual may also indicate which type of batteries your smoke alarm requires. • Don't throw away the manual. Keep it in a safe place where you can find it when you need it.  

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