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2. How to reset a smoke alarm that won’t stop beeping - AOL

   www.aol.com/reset-smoke-alarm-won-t-205535790.html

   $19.99 at Amazon . If you have a hard time remembering to replace your smoke alarm’s battery each year, the Kidde Smoke Detector can help. Its 10-year lithium battery doesn’t need to be replaced.

3. Smoke detector - Wikipedia

   en.wikipedia.org/wiki/Smoke_detector

   Residential smoke alarms are usually powered with a 9-volt battery, or by mains electricity. Some smoke alarms use a combination of the 2; usually using the 9V battery as an extra power source in the event of an outage. Commercial smoke detectors issue a signal to a fire alarm control panel as part of a fire alarm system. Usually, an individual ...

4. The Best Place to Put Your Smoke Detector (Plus 3 Spots ... - AOL

   www.aol.com/lifestyle/best-place-put-smoke...

   That means the battery needs to be changed. Replace smoke detectors at least every 10 years: Don't place your life in the hands of an outdated smoke alarm. For the most part, you can plan on ...

5. 6 vital home units: When to check or replace your furnace or ...

   www.aol.com/6-vital-home-units-check-101403555.html

   Fire alarms: In residential homes, a fire/smoke alarm should be replaced if it's more than 10 years old. If a test of the alarm indicates it's not working, the battery should be replaced.

6. Nine-volt battery - Wikipedia

   en.wikipedia.org/wiki/Nine-volt_battery

   Vintage PP3-size 9-volt batteries Size comparison of batteries: D, C, AA, AAA, AAAA, 9-volt (PP3) The nine-volt battery, or 9-volt battery, is an electric battery that supplies a nominal voltage of 9 volts. Actual voltage measures 7.2 to 9.6 volts, depending on battery chemistry.

7. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   This battery, introduced in 1901, was very common in continental Europe until the 1970s. It usually contains three B cells in series. In Switzerland as of 2008, 4.5-volt batteries account for only 1% of primary battery sales. [89] PP3, 9-volt, or E [90] Radio battery Smoke alarm battery Square battery Transistor battery 006P MN1604