JoeS, I checked into the owner's manual for "Regular Charging is discontinued" and there are 5 possible causes listed. The one that, I think, most reasonable for my case is "The temperature of the main drive lithium ion battery is too high or too cold to charge". Well, I think you have reminded me a more compelling cause "excessive voltage sag between cells" and it really gets to my nerve because it means " I have bad cells."
I do electric biking like you do and I remember one time while charging my 36V LiFePO4 pack, one bad cell popped and charging stopped. I did not use BMS because I considered it too tedious to use. But I use two metal wires to line up positive and negative terminals respectively after charging to balance out any differences between cells, no more BMS.
I am really interested in your suggestion of using CaniOn to have a real-time monitoring at individual cell voltage while charging to see how serious the sagging is. I am checking into CaniOn section of this forum. Maybe the super-smart on-board charger is saving my bad cells.
I sign in chargepoint website and key in USN and PSW, then I get to see the charging curve.
I am adding new charging curves recording the whole charging process, performed by Chargepoint EVSE, orchestrated by my imiev on-board charger for everyone to see.
This one is from the beginning to the time I unplugged the charger:
This one I started a new charging session until the end:
Total Energy into my battery pack is 8.835 KWh
Total elapse time is 2 hours 30 minutes