Here is my experience. I had some on the bench for a year and half. They voltage on some had dropped so I was curious what capacity was left. I discharged them and got 45 Ah. So I charged them and did another discharge and got about 60Ah. So I diss a charge and discharge 3 more times. The fifth time I got 100 Ah or full capacity. I suggest you disrobe it and charge it on a regular basis. Maybe a few more times now to recover capacity loss. I also have a paper about it if you want to read it I’ll dig it up.
Sent from AT&T Yahoo Mail for iPhone On Saturday, July 24, 2021, 8:01 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/20210724/12b09221/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
