Why don't you check the current draw with the car asleep? Sounds like it's definitely some parasitic load. If it was internal to the cells, it would likely go down to zero.
On Sat, Jul 24, 2021 at 6:01 AM Christopher Darilek via EV < ev@lists.evdl.org> 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 ev@lists.evdl.org > 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 > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20210724/5ca1b7a2/attachment.html> _______________________________________________ Address messages to ev@lists.evdl.org 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
