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From: Dirk Bruere at NeoPax on 18 Jun 2010 20:00 On 19/06/2010 00:40, bw wrote: > "Mark Thorson"<nospam(a)sonic.net> wrote in message > news:4C1BDEDC.7F485984(a)sonic.net... >> Androcles wrote: >>> >>> The best way to store a lot of energy in a small, lightweight space >>> is to use TNT, nitroglycerine or similar compounds. It is also not >>> practical for domestic application, it has too much energy. >> >> You don't understand explosives. They don't have >> more energy than other fuels. What they have is >> brisance, the ability to build up pressure quickly. >> Gasoline, for example, has about 10 times more >> energy content per unit weight than TNT. >> >> http://en.wikipedia.org/wiki/Trinitrotoluene#Energy_content > > > Yes, reaction rates matter here. > A loaf of bread has more energy than the same mass of nitroglycerine Not in a vacuum -- Dirk http://www.transcendence.me.uk/ - Transcendence UK http://www.blogtalkradio.com/onetribe - Occult Talk Show
From: "Piotr "Curious" Slawinski" on 20 Jun 2010 17:00 RichD wrote: > Battery technology is an active area of research, but an > obvious question occurs to me: why is it, no one has determined > the maximum possible energy/volume, and energy/weight? > And from there, discover the chemistry which achieves it? > > Is there some lacuna in our understanding of solid state physics > which necessitates an empirical, rather than theoretical approach? energy/volume and energy/weight limits are quite defined, problem is that design of battery involves not only chemistry, but also physics . i.e. take plain lead acid battery. it seems ideal from economy standpoint - it is assembled out of readily available substances (cheap). problem is it's lifetime is not very long, and it's mainly because of physical effects (diffusion, corrosion, evaporation). same goes with lot of other designs. --
From: John Fields on 23 Jun 2010 08:12 On Tue, 22 Jun 2010 21:57:27 +0000 (UTC), Cydrome Leader <presence(a)MUNGEpanix.com> wrote: >In sci.electronics.misc John Fields <jfields(a)austininstruments.com> wrote: >> On Tue, 22 Jun 2010 01:33:12 +0000 (UTC), Cydrome Leader >> <presence(a)MUNGEpanix.com> wrote: >>>>>Do you know if any companies still make large prismatic NiHM cells, in >>>>>similar form factors to the flooded aircraft started NiCd batteries? >>>> >>>> --- >>>> http://www.google.com/#hl=en&source=hp&q=large+prismatic+nimh+cells&aq=0&aqi=m1&aql=&oq=large+prismatic+NiHM+cells&gs_rfai=CEAOJYeUfTPLTAofAzQTJ9aHfDQAAAKoEBU_QshOL&fp=bff9aea6fcd663ae >>> >>>nothing relevent there. >> >> --- >> >> Checked all 120000 results, did you? >> >> BTW, what do you mean by "flooded aicraft started NiCd batteries"? > >here go over every result and tell me what you find > >http://www.google.com/#hl=en&q=aircraft+starting+battery+%2BNiCd+%2Bflooded&aq=f&aqi=&aql=&oq=&gs_rfai=&fp=d2eda4910a7445ea --- Aww... poor baby doesn't want to do her own legwork? If you're serious in your quest, I suggest you go to: http://www.concordebattery.com/dealers.php and peruse the various dealers' web sites for what you want. Johm Fields
From: Cydrome Leader on 23 Jun 2010 11:56 In sci.electronics.misc John Fields <jfields(a)austininstruments.com> wrote: > On Tue, 22 Jun 2010 21:57:27 +0000 (UTC), Cydrome Leader > <presence(a)MUNGEpanix.com> wrote: > >>In sci.electronics.misc John Fields <jfields(a)austininstruments.com> wrote: >>> On Tue, 22 Jun 2010 01:33:12 +0000 (UTC), Cydrome Leader >>> <presence(a)MUNGEpanix.com> wrote: > >>>>>>Do you know if any companies still make large prismatic NiHM cells, in >>>>>>similar form factors to the flooded aircraft started NiCd batteries? >>>>> >>>>> --- >>>>> http://www.google.com/#hl=en&source=hp&q=large+prismatic+nimh+cells&aq=0&aqi=m1&aql=&oq=large+prismatic+NiHM+cells&gs_rfai=CEAOJYeUfTPLTAofAzQTJ9aHfDQAAAKoEBU_QshOL&fp=bff9aea6fcd663ae >>>> >>>>nothing relevent there. >>> >>> --- >>> >>> Checked all 120000 results, did you? >>> >>> BTW, what do you mean by "flooded aicraft started NiCd batteries"? >> >>here go over every result and tell me what you find >> >>http://www.google.com/#hl=en&q=aircraft+starting+battery+%2BNiCd+%2Bflooded&aq=f&aqi=&aql=&oq=&gs_rfai=&fp=d2eda4910a7445ea > > --- > Aww... poor baby doesn't want to do her own legwork? > > If you're serious in your quest, I suggest you go to: > > http://www.concordebattery.com/dealers.php > > and peruse the various dealers' web sites for what you want. > > Johm Fields that's a really clever idea, Johm. I'll call up a company that only make lead acid batteries to buy giant NiMh cells.
From: John Fields on 23 Jun 2010 13:20
On Wed, 23 Jun 2010 15:56:11 +0000 (UTC), Cydrome Leader <presence(a)MUNGEpanix.com> wrote: >In sci.electronics.misc John Fields <jfields(a)austininstruments.com> wrote: >> On Tue, 22 Jun 2010 21:57:27 +0000 (UTC), Cydrome Leader >> <presence(a)MUNGEpanix.com> wrote: >> >>>In sci.electronics.misc John Fields <jfields(a)austininstruments.com> wrote: >>>> On Tue, 22 Jun 2010 01:33:12 +0000 (UTC), Cydrome Leader >>>> <presence(a)MUNGEpanix.com> wrote: >> >>>>>>>Do you know if any companies still make large prismatic NiHM cells, in >>>>>>>similar form factors to the flooded aircraft started NiCd batteries? >>>>>> >>>>>> --- >>>>>> http://www.google.com/#hl=en&source=hp&q=large+prismatic+nimh+cells&aq=0&aqi=m1&aql=&oq=large+prismatic+NiHM+cells&gs_rfai=CEAOJYeUfTPLTAofAzQTJ9aHfDQAAAKoEBU_QshOL&fp=bff9aea6fcd663ae >>>>> >>>>>nothing relevent there. >>>> >>>> --- >>>> >>>> Checked all 120000 results, did you? >>>> >>>> BTW, what do you mean by "flooded aicraft started NiCd batteries"? >>> >>>here go over every result and tell me what you find >>> >>>http://www.google.com/#hl=en&q=aircraft+starting+battery+%2BNiCd+%2Bflooded&aq=f&aqi=&aql=&oq=&gs_rfai=&fp=d2eda4910a7445ea >> >> --- >> Aww... poor baby doesn't want to do her own legwork? >> >> If you're serious in your quest, I suggest you go to: >> >> http://www.concordebattery.com/dealers.php >> >> and peruse the various dealers' web sites for what you want. >> >> Johm Fields > >that's a really clever idea, Johm. > >I'll call up a company that only make lead acid batteries to buy giant >NiMh cells. --- Well, darn. I guess you looked through that entire dealer list and couldn't find even one that carries NiMH batteries? I would've looked for you, but it's not really my project, is it? Anyway I guess you missed the part on their home page where there's a link to NiCd batteries that they supply lead-acid replacements for. Had you followed that link you most like likely would have found that there's a company, SAFT, who make giant NiMH batteries, maybe even in the form factor you're looking for. They're at: http://www.saftbatteries.com/ A link to their NiMH line is at: http://www.saftbatteries.com/Produit_NHP_329_51/Language/en-US/Default.aspx and if they don't have exactly what you want, I'd bet they know who does, and a call or an email might get you that info. If none of that works, go to: http://www.thomasnet.com/?cov=NA&heading=0000000&pslpid=0000000&WT.mc_t=PPC&WT.mc_n=mcgoog&WT.sem_engine=mcgoog&WT.sem_keyword=thomas+register&WT.srch=1&WT.z_sem_account=1&mctoken=v4v43576Z3a383409656900071272Z3a758Z3a2Z3aZ3aZ3a1662Z3a3f9250d3214e2f9Z3a and type: "Nickel-Metal Hydride aircraft batteries" into the search box. That'll take you to: http://www.thomasnet.com/prodsearch.html?cov=NA&which=prod&what=Nickel-Metal+Hydride+aircraft+batteries Where, if it's made in the US, you ought to be able to find who makes it. Anything else? |