Lee, Are those A123 still on the market? I haven't kept up on the batteries/companies.
Are the test results available? Can you send me a CSV or similar? -Chris Mr23 at Comcast dot net On September 23, 2014 6:09:39 PM CDT, Lee Hart via EV <[email protected]> wrote: >Marcus Reddish via EV wrote: >>> Are these the old white Thunder sky cells that failed? Seem to >remember a >>> picture of them leaking. Is it possible folks charged those early >cells >>> like they were lead and caused (or contributed to) the failures? I >have >>> not heard of any bad "batch" since the white cells, which was ages >ago. > >Willie2 via EV wrote: >> The situation Lee describes dates to 2000-2003? Something like that. >I >> know nothing of the situation but I believe they were LCP cells. >> Starting about 2005, LFPs were the preferred cells for conversions. I >> know of no quality or delivery problems with ThunderSky LFPs. > >My earliest ones were from a group buy organized by Victor Tikhonov in >2003. They were white prismatic Lithium-Cobalt cells, in both 90ah and >100ah models. Some of the 100ah cells were OK (maybe 3 out of 4 worked, > >but didn't meet specs). *All* of the 90ah cells were junk. Some leaked, > >but the main problems were low amphour capacity and excessive internal >resistance. Resistance on the 90ah cells was so high that they >overheated even with a 25 amp load. > >Maybe some of the purchasers abused their batteries and caused their >failures; but I certainly didn't. > >I've continued to borrow, barter, and buy various lithiums for testing. > >Prismatics and cylindrical, LiCo, LiMn, LiFe etc. They have >*consistently* failed to meet specs. Typically, their amphour capacity >and internal resistance are out of spec, with large variations between >cells, and a number of bad cells mixed in with the good. The most >recent >ones were GBS 100ah LiFe cells, tested just last year. The only >exception has been A123 3.2v 2.5ah LiFe cylindrical cells; they were >consistently good. > >I'm forever hopeful that the manufacturers will "get their act >together" >and start delivering an honest quality product, and stand behind them >with a warranty. But so far, if I'd spent good money for a full pack of > >any of these batteries (except A123), I would have been screwed. > >At the moment, I'm considering getting some Nissan Leaf cells to test. >I'm guessing that Nissan is likely to have made a *significant* effort >to get a good, quality product. I just have to make sure I'm not >getting >Nissan's QC rejects! >-- >If you would not be forgotten >When your body's dead and rotten >Then write of great deeds worth the reading >Or do these great deeds, worth repeating. > -- Ben Franklin, from Poor Richard's Almanac >-- >Lee Hart's EV projects are at http://www.sunrise-ev.com/LeesEVs.htm >_______________________________________________ >UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >http://lists.evdl.org/listinfo.cgi/ev-evdl.org >For EV drag racing discussion, please use NEDRA >(http://groups.yahoo.com/group/NEDRA) -- Sent from my Android device with K-9 Mail. Please excuse my brevity. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140923/d65dfa0c/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
