hey mcfly, thanks! It’s an idea, I’m not yet sure if it’s the correct method.
The idea is that when you want to charge the batteries you do as follow: you turn off the board by unplugging the loopkey as in the diagram, then you plu it into the battery u wish to charge. the balance leads of the same battery are right next to it so you can’t miss it. If battery1 is charged, unplug the loopkey and balance leads and plug it in battery2 etc. That way the charger XT90 cable can remain plugged into the same charger plug.
I didn realise that it would be a problem (about energising the VESC). A voltage is just a reference no? or is the VESC grounded through the motor?