I use Primary Lithiums in them, much longer life, less hassle. This is also what the wifi Nest smoke detectors come with: https://amzn.to/3Glx8Nb
On Tue, Nov 28, 2023 at 2:17 PM Cor van de Water via EV <ev@lists.evdl.org> wrote: > Remember the crazy PSA to replace your (almost new, what a waste!) smoke > alarm battery every half year? > True story: one guy did that faithfully, collected all those nearly-new > batteries for recycling in a baggie and... set his house on fire. Note that > this were the puny 9v cells! > I always regard that PSA as bollocks, monitor my smoke alarms and when they > beep or stop blinking the red light once a minute, *then* I replace the > battery. Happens maybe every 5 years, so I am not trashing cells that are > more than 90% capacity. > Again: what an organised waste! > Cor. > > On Tue, Nov 28, 2023, 1:59 PM (-Phil-) via EV <ev@lists.evdl.org> wrote: > > > When I was a kid, my hobby was mostly electronics, (big surprise, right?) > > and I had a perpetually messy room (lab) that drove my Mother crazy. > > (Again, big surprise?) She constantly threatened to "go in there, clean > it > > up and throw it all in the trash". One pre-teen day while I was at > > school, she finally made good on that promise and went in with a big > black > > trash bag and started throwing "all that junk" into it. When I came home > > all the windows were open (unusual) and the whole area smelled really > > toxic. When I went in, it was even worse, and my room had about a 4 foot > > circle of burnt wet carpet and black melted junk all over it. > > > > She had thrown away a small NiCad pack and it somehow shorted out in the > > trash bag before she could haul it out, and caught fire. She was able to > > put it out (luckily) with some water. I was grounded for a month. > She > > never attempted to touch my mess ever again though. > > > > Lithium batteries are no joke. I personally have had more than one > > accident and many close calls despite being well aware of the danger and > > being very careful. Sometimes it's not even in your control (like a > cell > > defect). If you often use low-cost products with built-in Lithium, get > a > > fire-safe bag and charge in it, and for large things try and do it > > outside. I now have a covered carport-type area away from the house > which > > I will use for any even slightly questionable battery activities. Also, > > have good quality smoke detectors, preferably ones with wifi connectivity > > so you get an alert if something happens, such as these: > > https://amzn.to/3Glx8Nb Yes, Expensive, but way less than a > homeowner's > > insurance deductible. One of these really saved an already bad accident > I > > had from a total disaster. > > > > On Tue, Nov 28, 2023 at 1:37 PM Mark E. Hanson via EV <ev@lists.evdl.org > > > > wrote: > > > > > Hi Folks, > > > > > > > > > > > > I remember in 2013 I was designing a UPS for my employer and had a A123 > > > 26650 cell on my desk & walked away for a couple minutes to pee and > when > > I > > > came back there was a crowd around as it apparently rolled into a > spiral > > > notebook and set it on fire! > > > > > > > > > > > > Fairly embarrassed, but the other engineers were impressed by the > amount > > of > > > current/destruction a single cell could do! > > > > > > > > > > > > > > > > > > Have a renewable energy day, > > > > > > > > > > > > Mark > > > > > > > > > > > > Mark E. Hanson > > > > > > 184 Vista Lane > > > > > > Fincastle, VA 24090 > > > > > > 540-473-1248 phone & FAX, 540-816-0812 cell > > > > > > REEVA: community service RE & EV project club > > > > > > Website: www.REEVAdiy.org (See Project Gallery) > > > > > > UL Certified PV Installer > > > > > > My RE&EV Circuits: www.EVDL.org/lib/mh > > > > > > REEVA Demo: <http://youtu.be/4kqWn2H-rA0> http://youtu.be/4kqWn2H-rA0 > > > > > > > > > < > > > > > > https://www.weatherlink.com/embeddablePage/show/a88920376f864ecabaed843dd89 > > > 75b8d/signature > > > < > > > https://www.weatherlink.com/embeddablePage/show/a88920376f864ecabaed843dd8975b8d/signature > > >> > > > Fincastle Solar Weather Station > > > > > > > > > > > > > > > > > > > > > > > > Date: Mon, 27 Nov 2023 21:15:13 -0800 > > > > > > From: Cor van de Water <cor.vandewa...@gmail.com > > > <mailto:cor.vandewa...@gmail.com> > > > > > > > To: Electric Vehicle Discussion List <ev@lists.evdl.org > > > <mailto:ev@lists.evdl.org> > > > > > > > Subject: Re: [EVDL] I destroyed an A123 26650 by shorting to the case. > > > > > > Message-ID: > > > > > > > > > <CALdL5i3dyE3nJBu==mxa7mthkcohc_q04fhwco-jy6m7ltv...@mail.gmail.com > > > <mailto:CALdL5i3dyE3nJBu== > > mxa7mthkcohc_q04fhwco-jy6m7ltv...@mail.gmail.com > > > > > > > > > > > > > > Content-Type: text/plain; charset="utf-8" > > > > > > > > > > > > Lawrence, when I removed some of the cells from that pack that you > picked > > > up, I cut the straps with heavy duty scissors. > > > > > > One time I accidentally shorted the cell I was removing while cutting > and > > > the current was large enough to bite a chunk out of the scissor > blades... > > > > > > These are *very* low resistance cells, so the short circuit current > > > consequently is very high, even at the low 3.5V of a single cell. > > > > > > Cor. > > > > > > > > > > > > > > > > > > -------------- next part -------------- > > > An HTML attachment was scrubbed... > > > URL: < > > > > > > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231128/5f857a93/attachment.htm > > > > > > > _______________________________________________ > > > Address messages to ev@lists.evdl.org > > > No other addresses in TO and CC fields > > > HELP: http://www.evdl.org/help/ > > > > > > > > -------------- next part -------------- > > An HTML attachment was scrubbed... > > URL: < > > > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231128/d3958161/attachment.htm > > > > > _______________________________________________ > > Address messages to ev@lists.evdl.org > > No other addresses in TO and CC fields > > HELP: http://www.evdl.org/help/ > > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20231128/77117140/attachment.htm > > > _______________________________________________ > Address messages to ev@lists.evdl.org > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > > -------------- next part -------------- An HTML attachment was scrubbed... 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