This is because there is only enough undecayed Americium in the 10-YO smoke detectors to supply radioactive boyscouts with reactor fuel :)
-mel > On Jan 13, 2021, at 11:49 PM, b...@theworld.com wrote: > > > On January 14, 2021 at 04:56 j...@baylink.com (Jay R. Ashworth) wrote: >> Well, it probably gets way worse: if it's a "permanent" battery, it will be >> harder to find, and harder to replace... > > No, you don't replace the permanent batteries in these 10 year smoke > detectors, you toss the whole smoke detector and buy a new one. Heroic > efforts aside. > > So you don't need to find the right battery. > > FWIW many smoke detectors bought in the past 10-15 years (I dunno but > something like that) even with typical replaceable batteries have some > sort of timer in them so when they hit 10 years they begin beeping in > a slightly different pattern (like two short beeps every 60 seconds) > and replacing the battery doesn't help. It just begins doing that on > the fresh battery until you figure out that you need to toss the > detector and buy a new one. > > Ran into that, looked it up on their web site as I was confused why a > new battery wasn't helping and they confirmed that means the detector > has expired buy a new one. > > I assume these 10 year sealed smoke detectors somehow came out of > that. > >> >> ----- Original Message ----- >>> From: "William Herrin" <b...@herrin.us> >>> To: "jra" <j...@baylink.com> >>> Cc: b...@theworld.com, nanog@nanog.org >>> Sent: Wednesday, January 13, 2021 11:52:47 PM >>> Subject: Re: End-user Alert Delivery (was Re: NDAA passed: Internet and >>> Online Streaming Services Emergency Alert Study) >> >>> On Wed, Jan 13, 2021 at 7:58 PM Jay R. Ashworth <j...@baylink.com> wrote: >>>> Last time I looked, consumer residential smoke detectors were still running >>>> off 9V alkaline batteries, which are expected to run the device for 6 >>>> months >>>> of 1/99 duty cycle (or less, probably *way* less). >>> >>> Ordinary ionization-based smoke detectors use a 10-year lithium >>> battery, which is about the same lifespan as the americium-based >>> detector circuit as it begins to decay into neptunium. >>> >>> You may now resume your argument over how much battery drain is too much. >>> >>> Regards, >>> Bill Herrin >>> >>> >>> -- >>> Hire me! https://bill.herrin.us/resume/ >> >> -- >> Jay R. Ashworth Baylink >> j...@baylink.com >> Designer The Things I Think RFC >> 2100 >> Ashworth & Associates http://www.bcp38.info 2000 Land Rover >> DII >> St Petersburg FL USA BCP38: Ask For It By Name! +1 727 647 >> 1274 > > -- > -Barry Shein > > Software Tool & Die | b...@theworld.com | > http://www.TheWorld.com > Purveyors to the Trade | Voice: +1 617-STD-WRLD | 800-THE-WRLD > The World: Since 1989 | A Public Information Utility | *oo*
