Smoke / CO detector 9V battery recommendation.

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sbslider
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Smoke / CO detector 9V battery recommendation.

Last time I purchased replacement batteries for the smoke detectors I got Energizer advance lithiums. One has given up after 4 years. I have not measured the remaining 5 to see where they are (yet), wondering if anyone has a recommendation for this application.

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ChrisGarrett
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I think that I’d stick with the Energizer Lithiums. I have lots of smoke detectors and I need to get the Energizers. 4 years isn’t bad. My one detector is 15 feet above my floor and while I keep a 12’ wooden ladder in my condo, it’s a slight chore to get it out and set it up.

Once every 4 years would be fine.

Chris

Terry Oregon
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Be aware that some smoke detectors caution against the use of 9V lithium batteries.

 

https://www.consumerreports.org/cro/news/2014/02/safe-to-use-litium-batteries-in-smoke-detectors/index.htm

 

Quote:
Lithium 9Vs aren’t recommended for smoke detectors unless you follow a strict battery replacement schedule. Those batteries maintain a high voltage until the end of their usable life, so they provide a much shorter “low battery” warning to alert you that it’s time to swap in a fresh one. Alkaline batteries, by comparison, have a more gradual voltage drop-off, prolonging the “low battery” alert and greatly increasing the odds that you’ll be nearby to get the alert.

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hank
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Yep, that’s an appropriate caution from CR:

Quote:
Lithium 9Vs aren’t recommended for smoke detectors unless you follow a strict battery replacement schedule. Those batteries maintain a high voltage until the end of their usable life, so they provide a much shorter “low battery” warning to alert you that it’s time to swap in a fresh one. Alkaline batteries, by comparison, have a more gradual voltage drop-off, prolonging the “low battery” alert and greatly increasing the odds that you’ll be nearby to get the alert.

What I want is a smoke detector that doesn’t start its low-voltage beeping in the middle of the night.

sbslider
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hank wrote:
What I want is a smoke detector that doesn’t start its low-voltage beeping in the middle of the night.

It generally happens then as the temperature is the coldest, so the battery voltage droops a bit and hits the threshold for the beeping.

As far as not using lithiums in smoke detectors, I have no problem with doing it, but I appreciate the caution.

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lotrbfme
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This happened to me when I put Lithium AA on my door lock. It never gave me a low battery warning and I got locked out of my house. Thankfully I had a backup key

candor
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Same thing happened to me with the keypad lock to my shed/studio. Unfortunately I couldn’t remember what I did with the key and had to break in. The instructions said to use alkaline and not lithium but I didn’t listen.

CREEXHP70LED
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Hank, they actually make those detectors that do not go off at 2 AM.

They were Carbon Monoxide and smoke though if I remember right. All I know is I just replaced (2) CO/Smoke detectors and the cells in 12 more smoke detectors. The ceilings are only 9 foot where I live now, they used to be over 25 feet high.

I replaced the cells with Energizer alkalines not lithiums.