in early charger models they do this.
Calibrating the SoC solely by voltage is a tricky thing.
The BMS counts the power drained from the battery and tries to make sense of the voltage and milage you get.
Ever notice that the miles you still get around 50% seem to stagnate.
The BMS is trying to recalibrate cause it was to pessimistic.(build to do so).
So if the Battery does not behave like the model that is bulid in the BMS your charger is turned off at 98%
Normally this happens in the winter or when the battery gains a lot of temperature while loading in the summer.
Does not mean you have less range after the charger shuts off.
In the newer charger models they gave up.
They took the balancing right out of the procedure.
My charger displays 100% for about 15-25 minutes while it is balancing the Battery.
(Still charging it with 1/3 of the max current!)
The SoC climbs from 99,1% to 99,9% in this time.
For the old ones it went from 95% to 100% and sometimes cut off at 98% cause the battery had reached the max voltage.