Out of my 4 cells in the Bluetooth, as soon as one reaches 3.61v or 3.62v the BMS cuts off charging and it goes into balancing mode by bleeding the one or two that are high - but the two lower ones never catch up.
My total volts are always 13.6 to 13.8, my Diff Volt can be as high as 0.190v.
Plus the bluetooth cuts off all the time, even when my phone is right beside it.
After some 15 minutes, these are the 4 reported cells. Remember, these are 8 cylinder cells in the 100AH battery. Not 4 prismatics.
3.539v 3.355v 3.538v 3.378v