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Old 01-14-2020, 01:54 PM   #1
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Lithium 9volt smoke alarm batteries

Hi,

I need to replace the batteries in the smoke alarm and carbon monoxide detectors in the coach.

I was just about to order some lithium 9v but just read they should not be used.

Any thoughts?

Thanks,
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Old 01-14-2020, 02:47 PM   #2
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I would question the source. They work in my detectors. Where did you read this?
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Old 01-14-2020, 02:53 PM   #3
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Looks like your answer is yes & no. See this Consumer Reports Q & A:

https://www.consumerreports.org/cro/...tors/index.htm

Seems like if you replace them on a regular schedule you'll be okay, but if you are one that relies on the low-battery warning beep before replacing you'll have problems.
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Old 01-14-2020, 02:54 PM   #4
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So another attempt to idiot-proof the world. Canít be done....but I can see concerns over liability.
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Old 01-14-2020, 03:24 PM   #5
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Hi,

It was indeed the low battery alarm I read about.
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Old 01-14-2020, 03:42 PM   #6
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So another attempt to idiot-proof the world. Canít be done....but I can see concerns over liability.
Did you look at the link I posted?

Doesn't seem like an attempt to do anything other than warn people of a potential downside of using a lithium battery in a smoke detector. To summarize the Consumer Reports information, the voltage drops much more quickly in a lithium battery than a traditional one towards the end of the useful life. The result is that the low-battery warning beeps on a lithium battery will be very short lived. Anyone used to having at least a few days of annoying beeps could easily miss the warning beeps from a lithium battery.

Solution is easy - establish a regular battery replacement schedule and stick with it.

To me, the lithium 9v batteries don't seem worth the extra money. I use the annual battery replacement as a time to test and clean the detectors, and regular 9v batteries have worked well for many years.
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Old 01-14-2020, 04:01 PM   #7
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Originally Posted by richard5933 View Post
Did you look at the link I posted?

Doesn't seem like an attempt to do anything other than warn people of a potential downside of using a lithium battery in a smoke detector. To summarize the Consumer Reports information, the voltage drops much more quickly in a lithium battery than a traditional one towards the end of the useful life. The result is that the low-battery warning beeps on a lithium battery will be very short lived. Anyone used to having at least a few days of annoying beeps could easily miss the warning beeps from a lithium battery.

Solution is easy - establish a regular battery replacement schedule and stick with it.

To me, the lithium 9v batteries don't seem worth the extra money. I use the annual battery replacement as a time to test and clean the detectors, and regular 9v batteries have worked well for many years.
I agree no need to waste money on the lithium batteries. use reg batteries and change them every year on your birthday.
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Old 01-14-2020, 04:22 PM   #8
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Thanks all for the replies,

I did not get a chance to read the consumer reports link, will do later.
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Old 01-14-2020, 05:13 PM   #9
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Solution is easy - establish a regular battery replacement schedule and stick with it.

To me, the lithium 9v batteries don't seem worth the extra money. I use the annual battery replacement as a time to test and clean the detectors, and regular 9v batteries have worked well for many years.
Totally agree.

I've followed my dad's advice on smoke detectors, standby flashlights and TV remotes (actually anything with an easily forgotten battery): "You'll never have problems with dead batteries or corroded contacts if you give the item a present of a new battery every Christmas and Easter."

And watch out for the dollar store batteries... they are made to a price and usually outdated before you buy them. They are OK for kids toys, but for something important like a smoke alarm I prefer Costco's own brand - there is enough turnover in the store that they are always reasonably fresh.
I've been told by multiple people that they are made by Duracell but have no way to verify that.

Mike
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Old 01-14-2020, 05:39 PM   #10
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i cheated and purchased for the RV garage and rv the ones that have the ten year built in battery, since you are to change the detector out in ten years its all one.


we shall see in 8 years if they held up


lowes had them
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Old 01-14-2020, 05:59 PM   #11
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I agree, If those are the original detectors in your '08 then they are overdue for replacement. They gradually get less sensitive and at the 10 year mark probably would not give you enough warning if they work at all. Nice to be able to replace them with 10 year batteries.
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Old 01-14-2020, 06:06 PM   #12
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I agree, If those are the original detectors in your '08 then they are overdue for replacement. They gradually get less sensitive and at the 10 year mark probably would not give you enough warning if they work at all. Nice to be able to replace them with 10 year batteries.
Hi,

They are about 20 months old, I checked the dates today. I also swapped out the propane detector last year.
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Old 01-14-2020, 06:09 PM   #13
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I bought new smoke detectors and lithium 9 volt backup batteries to replace the 10 year old smoke detectors in my house a couple of years ago. So far every single lithium battery has caused the detectors to start beeping, usually at 3 am. I replaced them with regular Alkaline batteries and so far so good. I don't know what it is with the lithiums but I read somewhere to not use them and I wish I hadn't. The original detector batteries lasted at least 5 years before one started beeping and I replaced them all. These are 120 volt powered with batteries as backups btw.
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Old 01-14-2020, 08:55 PM   #14
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Quote:
Originally Posted by richard5933 View Post
Did you look at the link I posted?

Doesn't seem like an attempt to do anything other than warn people of a potential downside of using a lithium battery in a smoke detector. To summarize the Consumer Reports information, the voltage drops much more quickly in a lithium battery than a traditional one towards the end of the useful life. The result is that the low-battery warning beeps on a lithium battery will be very short lived. Anyone used to having at least a few days of annoying beeps could easily miss the warning beeps from a lithium battery.

Solution is easy - establish a regular battery replacement schedule and stick with it.

To me, the lithium 9v batteries don't seem worth the extra money. I use the annual battery replacement as a time to test and clean the detectors, and regular 9v batteries have worked well for many years.

Makes sense Thatís what lithiumís do
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