I'm using 505's as well. almost makes me want to sell my 109's so I can balance while charging.. and i have access to a DMM at work, but don't have the money for a personal one right now, vacation's less than a week away for me, so I'm scrounging for money lol

the good pack charged in:
55:35
2.614Ah
21.00v

the pack I had trouble balancing:
59:39
2.855Ah
21.00v

odd thing is.. in the bad pack, cell 2 was lower voltage than the rest last night.. I just took it off the charger, and cell 2 is HIGHER than all the other cells, and has been discharging for about 20 minutes now..