That Re-balance play might be a good thing to try.. If you own a good charger or one of those fancy power supplies..
When I was working, I had those nice power supplies all over my bench..
But, if I had to re-balance our pack, I would use my old RC airplane charger..(this model).
http://www.rcgroups.com/gallery/data...06charger2.jpg
Which is pretty adjustable in voltage and current, when used in manual mode.