The worst thing you can do to LiFPO is to charge it fully, and let it sit around, especially in a hot location. For long term storage, I would guess the best thing is maybe 50% SOC, and keep it as cool as you can without actually refrigerating it (though I don't know if that is a bad thing). You can quickly ruin a LiFPO pack by charging your eBike in a hot sunny place, and leaving it on the charger after full charge, and with the sun. I speak from experience. I would avoid exceeding 90°F when fully charged.
On Sat, Jul 24, 2021 at 9:01 AM Christopher Darilek via EV < [email protected]> wrote: > Hi Guys, > > I have an 8 year old LiFePO4 pack in my car and wonder if anyone knows > what the end of life failure mode is for these? > > Over the pandemic lock down I was not driving the car for 3 months and > noticed one day that all the cells were flat, ~2V. I attributed this to > some parasitic loads over the 3mo, and charged it back up. > > Then, with a full charge I drove ~10 miles (about 25% of my 'old' range) > and parked, and after a couple weeks noticed I was back ~2V per cell. > > I put it on charge and it seems to have charged up and is holding voltage > now. > > Is this how LiFePO4 batteries toss in the towel or do I still have a > parasitic load to debug? What is the failure mode? > > Thanks for any tips. > Chris > http://www.evalbum.com/4743 > _______________________________________________ > 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20210724/9870a715/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
