Some of you know this, and the info is not current, but is good for LiFePO. Anyhow, just to be complete in the discussion:
When a cell is discharged, the lithium ions are on the anode and the cathode is depleted of ions. This is a pretty benign state chemically. But as the cathode loads up Li ions from charging the anode becomes very reactive. So reactive that it starts to tear up the electrolyte. Heat just makes it worse. With advancements in additives to help the electrolyte stay healthy Li cells became steadily more durable. Older CALB and other brands cells are liable to be deficient after many years. Buyer beware. Maya WoulfeiFEPO and circa 2015 On Sun, Jul 25, 2021 at 12:20 AM Michael Ross <[email protected]> wrote: > For LiFePO, a parasitic load might be protective. It's that full charge > that is destructive. > > On Sat, Jul 24, 2021 at 11:40 PM EVDL Administrator via EV < > [email protected]> wrote: > >> On 24 Jul 2021 at 21:04, Michael Ross via EV wrote: >> >> > The worst thing you can do to LiFPO is to charge it fully, and let it >> sit >> > around, especially in a hot location. >> >> Isn't that the case for lithium batteries of any chemistry? I'm not a >> lithium expert by any means; I'm just asking. >> >> It occurs to me that some of Chris's parasitic loads could be coming from >> "inside the house," so to speak. That is, they might be from the BMS. >> >> I have 24v and 36v 10ah LiFePO4 batteries with a BMS with logic that's >> powered by a 12v tap (not the optimum design), and the 4 cells that power >> the BMS always take longer than the others to reach full charge. For >> long >> term storage I have read a suggestion to disconnect the BMS if possible - >> but don't forget to reconnect it when taking the battery out of storage. >> >> David Roden, EVDL moderator & general lackey >> >> To reach me, don't reply to this message; I won't get it. Use my >> offlist address here : http://evdl.org/help/index.html#supt >> >> = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = >> First they came for the journalists. We don't know what >> happened after that. >> >> -- Unknown >> = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = >> >> _______________________________________________ >> Address messages to [email protected] >> No other addresses in TO and CC fields >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> ARCHIVE: http://www.evdl.org/archive/ >> LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> > > > -- > Michael E. Ross > (919) 585-6737 Land > (919) 901-2805 Cell and Text > (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Tablet, > Google Phone and Text > > > > -- Michael E. Ross (919) 585-6737 Land (919) 901-2805 Cell and Text (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Tablet, Google Phone and Text -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20210725/70898883/attachment.html> _______________________________________________ Address messages to [email protected] No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org
