FlexiBMS - battery not charging over 80 percent (second one now, different type)

How-Tos & Esk8 mechanics Esk8 Mechanics
#1

Hi there, I’m having some trouble charging recently. It didn’t do that in the beginning but started after a few months. It goes to around 80 percent then then stops. If I unplug it and plug it back in it sometimes does the full charge. Recently it starts to be more and more on and off though. I had the same issue on an older board. In that case I used a different charger and it seemed to work. But before I buy the NEXT charger I was wondering if it could have other causes.
my thoughts were:
firmware and FlexiBMS settings???
charger?
cabeling? how important is it and why that balance cables don’t touch/cross? Or is it at all?
Doesn’t seem to be heat related.
Not sure how to troubleshoot that.
Grateful for any input.
Thanks

Sebastian

#2

Measure the voltage coming out of the charger with a volt meter

Read the states of charge off of each cell based on the BMS

Report back to us

#3

thanks. the bms isn’t hooked up to anything that could read it. i could only measure each cell. currently got the flexibms for the small form factor

#4

You’ll want to check them by hand then, if a cell is way off it won’t let the system finish charging

#5

If you’re connected to the ecs CAN and have a BT module, Freesk8 App should allow you to see cell readout

1 Like