The only true "negative" pin (or ground) is the one marked with a "-" sign, every other pin in the balance port is a "positive" for the first cell AND a negative for the next cell, and so on. I think you may misunderstand what, and how, the balance port on the charger works. Here is a good video from Bruce Simpson (XJet pilot handle) who has been a staple in this hobby since before Joshua Bardwell was out of diapers. The good stuff starts at 6:08 in the video.
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