On the first pack I tried to balance first; when that was taking to long I just tired a balance charge. The charge timed out with the pack at 97%. All cells took a good charge and the voltage diffrence remained about the same. In other words like yours one cell just wanted to stay behind the others. After using my stand alone balncer that cell finally balanced with the other cells and then it took a full charge no problems. The senario is strange
, I can't wait to track test these packs and see how the cell votages hold.