Post by thread:[EE] FePH batteries

On Aug 20, 2008, at 10:09 AM, alan smith wrote: > Has anyone worked with IronPhosphate based batteries? These are > supposed to be a better alternate to Lithium based, but the > charging is somewhat different, and the voltage a little lower at 3.2V They're still LITHIUM batteries, but with a different (safer) cathode (?) material. "Better" generally means "safer"; the energy density is somewhat lower than normal Li-ion cells. This technology is used in the deWalt lithium power tools, and has been used by both the RC people and the candlepowerforum crowd. The power-tool batteries use FANCY (nano-particle) iron phosphate, and have very impressive current capabilities; I don't think that ALL of the FePO4 batteries use this technology, though. The same chinese vendors and battery resellers willing to sell you bare Li-ion cells typically also sell Li-FePO4 cells; I've no personal experience with any of them. http://www.dealextreme.com/search.dx/search.lifepo4 BillW

The popular name for the cells is "A123" John Ferrell W8CCW "All that is necessary for the triumph of evil is for good men to do nothing." -- Edmund Burke http://DixieNC.US ----- Original Message ----- From: "alan smith" <spam_OUTmicro_eng2TakeThisOuTyahoo.com> To: "Microcontroller discussion list - Public." <.....piclistKILLspam@spam@mit.edu> Sent: Wednesday, August 20, 2008 1:09 PM Subject: [EE] FePH batteries > Has anyone worked with IronPhosphate based batteries? These are supposed > to be a better alternate to Lithium based, but the charging is somewhat > different, and the voltage a little lower at 3.2V > > > > > --

We use them as batteries for our combat robot. I can safely say they are "tolerant of abuse" ;-> John Ferrell wrote: > The popular name for the cells is "A123" > John Ferrell W8CCW > > "All that is necessary for the triumph of evil is for good men to do > nothing." -- Edmund Burke > http://DixieNC.US > > {Original Message removed}

On Aug 20, 2008, at 3:58 PM, John Ferrell wrote: > The popular name for the cells is "A123" A123 cells are a particular (very good!) brand of LiFePO4 cells, from http://www.a123systems.com/ These are the ones used in power tools that I mentioned, using "nanotechnology" as well as the different chemistry. However, there ARE LiFePO4 cells that are not from A123systems. These retain the improved safety, but have discharge capabilities typical of "normal" Li-ion cells... BillW

John Ferrell wrote: > The popular name for the cells is "A123" No, A123 is the name of company that manufacturs lithium ion cells and power systems using them. Their headquarters are at 321 Aresnal Street, Watertown MA. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000.

In the Radio Control Airplane field "A123" has become a brand name like "Kleenex", "Aspirin" or "Xerox". When compared to LiPo batteries they lose on weight, are equal in price but much better in terms of safety, life and tolerance to abuse. John Ferrell W8CCW "All that is necessary for the triumph of evil is for good men to do nothing." -- Edmund Burke http://DixieNC.US {Original Message removed}

Are you able to source the cells in smallish numbers individually, or are you "harvesting" from Bosch products? -----Original Message----- {Quote hidden}>From: Jake Anderson <jakeKILLspamvapourforge.com> >Sent: Aug 20, 2008 6:05 PM >To: "Microcontroller discussion list - Public." <.....piclistKILLspam.....mit.edu> >Subject: Re: [EE] FePH batteries > >We use them as batteries for our combat robot. >I can safely say they are "tolerant of abuse" ;-> > >John Ferrell wrote: >> The popular name for the cells is "A123" >> John Ferrell W8CCW >>

Individualy or assembled packs. http://www.bphobbies.com/view.asp?id=C2116942&pid=C2126943 John Ferrell W8CCW "All that is necessary for the triumph of evil is for good men to do nothing." -- Edmund Burke http://DixieNC.US ----- Original Message ----- From: "'Grif'" <EraseMEkgriffitspam_OUTTakeThisOuTwolfenet.com> To: "Microcontroller discussion list - Public." <piclistspam_OUTmit.edu> Sent: Thursday, August 21, 2008 11:44 AM Subject: Re: [EE] FePH batteries > > Are you able to source the cells in smallish numbers individually, or are > you "harvesting" from Bosch products? > > > {Original Message removed}

Thanks,,, just what I was looking for. -----Original Message----- {Quote hidden}>From: John Ferrell <@spam@johnferrellKILLspamearthlink.net> >Sent: Aug 21, 2008 5:41 PM >To: "Microcontroller discussion list - Public." <KILLspampiclistKILLspammit.edu> >Subject: Re: [EE] FePH batteries > >Individualy or assembled packs. >http://www.bphobbies.com/view.asp?id=C2116942&pid=C2126943 > >John Ferrell W8CCW > >"All that is necessary for the triumph of evil is for good men to do >nothing." -- Edmund Burke >http://DixieNC.US > >----- Original Message ----- >From: "'Grif'" <RemoveMEkgriffitTakeThisOuTwolfenet.com> >To: "Microcontroller discussion list - Public." <spamBeGonepiclistspamBeGonemit.edu> >Sent: Thursday, August 21, 2008 11:44 AM >Subject: Re: [EE] FePH batteries > > >> >> Are you able to source the cells in smallish numbers individually, or are >> you "harvesting" from Bosch products? >> >> >> -----Original Message----- >>>From: Jake Anderson <TakeThisOuTjakeEraseMEspam_OUTvapourforge.com> >>>Sent: Aug 20, 2008 6:05 PM >>>To: "Microcontroller discussion list - Public." <RemoveMEpiclistTakeThisOuTmit.edu> >>>Subject: Re: [EE] FePH batteries >>> >>>We use them as batteries for our combat robot. >>>I can safely say they are "tolerant of abuse" ;-> >>> >>>John Ferrell wrote: >>>> The popular name for the cells is "A123" >>>> John Ferrell W8CCW >>>> >> --