9v battery terminal blanks?
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From: Spehro Pefhany on 21 Dec 2008 10:28 On Sun, 21 Dec 2008 11:19:14 +0000, the renowned "Ron(UK)" <ron(a)lunevalleyaudio.com> wrote: >Peter Hucker wrote: > >> >> Designing anything for alkalines only in ths day and age is absurd. > >In your opinion maybe. Professionals in the sound industry use quality >replaceable batteries, they are reliable - reliability means >_everything_ when a show (or your job) is at stake. > >> >> P.S. rechargeables have LESS internal resistance. Try shorting a rechargeable and see how hot it gets. > >Try shorting a 9 volt Procell! stand well back tho... > >Ron John W. measured something like 90A from a shorted rechargeable (NiCd, IIRC) 9V battery. Enough to cause a real explosion. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff(a)interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
From: Michael A. Terrell on 21 Dec 2008 10:50 Spehro Pefhany wrote: > > On Sun, 21 Dec 2008 11:19:14 +0000, the renowned "Ron(UK)" > <ron(a)lunevalleyaudio.com> wrote: > > >Peter Hucker wrote: > > > >> > >> Designing anything for alkalines only in ths day and age is absurd. > > > >In your opinion maybe. Professionals in the sound industry use quality > >replaceable batteries, they are reliable - reliability means > >_everything_ when a show (or your job) is at stake. > > > >> > >> P.S. rechargeables have LESS internal resistance. Try shorting a rechargeable and see how hot it gets. > > > >Try shorting a 9 volt Procell! stand well back tho... > > > >Ron > > John W. measured something like 90A from a shorted rechargeable (NiCd, > IIRC) 9V battery. Enough to cause a real explosion. I used to have a badly damaged wireless mic that caught fire while in use. If it hadn't been in a thick leather case the user would have had third degree burns where the ni-cads failed. He got some first & second degree burns as it was. The inside of the leather case was soaked with the contents of the vented cells, which would have caused more damage. The brand & model information was burnt off, along with most of the circuitry. The man using it reportedly grabbed it from his chest & threw it across the room before it could do more damage. When they showed it to me they didn't know who made it, and the dealer they bought it from was out of business. -- http://improve-usenet.org/index.html aioe.org, Goggle Groups, and Web TV users must request to be white listed, or I will not see your messages. If you have broadband, your ISP may have a NNTP news server included in your account: http://www.usenettools.net/ISP.htm There are two kinds of people on this earth: The crazy, and the insane. The first sign of insanity is denying that you're crazy.
From: Peter Hucker on 21 Dec 2008 11:51 On Sat, 20 Dec 2008 20:19:02 -0000, Geoffrey S. Mendelson <gsm(a)mendelson.com> wrote: > Peter Hucker wrote: >> There are Lithium AAs. > > There are 1.5 volt lithium batteries, such as AA's. They are rare, and > have extremely long shelf life, but I have never seen specs for > discharge rate, etc. > > The only ones I have ever seen were packed with a fan powered gas mask, > but I think you can get them if you shop around. http://www.farnell.co.uk Search for lithium aa There are loads of name brands. > Considering the shelf life of alkeline batteries sold here is less than > a year, even the "name brands". It's almost a moot point. We no longer > get any batteries from west of us, they all come from Korea, "China" > (inside the PRC), Singapore or Hong Kong. LESS THAN A YEAR?!?!?! I have Duracells with a use by date of about 4 or 5 years in the future. -- http://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com In light of the Madrid bombing, France has raised its terror alert level from "run" to "hide." The only two higher levels in France are "surrender" and "collaborate."
From: Peter Hucker on 21 Dec 2008 12:02 On Sun, 21 Dec 2008 15:28:09 -0000, Spehro Pefhany <speffSNIP(a)interlogdotyou.knowwhat> wrote: > On Sun, 21 Dec 2008 11:19:14 +0000, the renowned "Ron(UK)" > <ron(a)lunevalleyaudio.com> wrote: > >>Peter Hucker wrote: >> >>> >>> Designing anything for alkalines only in ths day and age is absurd. >> >>In your opinion maybe. Professionals in the sound industry use quality >>replaceable batteries, they are reliable - reliability means >>_everything_ when a show (or your job) is at stake. >> >>> >>> P.S. rechargeables have LESS internal resistance. Try shorting a rechargeable and see how hot it gets. >> >>Try shorting a 9 volt Procell! stand well back tho... >> >>Ron > > John W. measured something like 90A from a shorted rechargeable (NiCd, > IIRC) 9V battery. Enough to cause a real explosion. Duracell quote PP3 9v internal resistance as 1.7ohm, which makes the Short circuit current 5.29 Amps - not nearly as much as a NiCd! http://www.duracell.com/oem/Pdf/new/MN1604_US_CT.pdf -- http://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com ( )) ((( )))) ((((( /`-./\.-'\ \ / \ / ) ( \ / %%%%%% %%%% %%%% %%%% %%%% `--'
From: Geoffrey S. Mendelson on 21 Dec 2008 12:09
Peter Hucker wrote: > LESS THAN A YEAR?!?!?! I have Duracells with a use by date of about 4 > or 5 years in the future. So do I. They rarely last more than a year before they leak, and some brands even less. Before they changed from some anonymous Chinese manufacturer to GPT, the Office Depot brand sold here lasted 3-4 months. Geoff. -- Geoffrey S. Mendelson, Jerusalem, Israel gsm(a)mendelson.com N3OWJ/4X1GM |