i hope i havnt understood the question,
but as i understand the question, here is my answer...............
i used to use one of these to check voltage of cells
http://www.ebay.co.uk/itm/Li-Po-Batt...item45fd93aa1e
now i use one of these
http://www.ebay.co.uk/itm/Li-Po-Guar...a#ht_766wt_964
you will just need to put your charge leads into the battery then plug the balance lead into the checker,
it will tell you the voltage of each cell and the voltage of both cells together.