I have rebuild two NiCad battery packs. I have the cells from the old ones. I don't believe they are all dead, only one or two (or a few). I have a rig to test them and one to charge them. I can charge them individually (yeah, that will take a week) or charge them as a pack. Should they be charged in series as they are used, or can they be charged in parallel? Can they be charged in parallel (the charger has the ampacity to do so, so I can from that aspect). If one of the cells is bad and they are charged in series, will the good cells charge properly?