@CarvingUphillAVL I have noticed something similar. I could not get the charge to 100% even after repeatedly leaving it to balance for 48 hours. However, each time I drain the battery and recharge, I am noticing it getting closer to 100%.
As @njcustom noted, the batteries should not need to be drained prior to charging. Empirically though, after repeatedly draining to ~50% and recharging, there seems to be something that is preventing the battery to 100%.