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Ohhh... I missed that. Assumed it was another micro. Oops. Man... that's esoteric stuff. Wonder why one would choose that over optical? Current draw seems low, but not super low, at ~1-5mA per channel.

Hard to say. I don't remember where the OP said the modules connect together -- if it's the white WTB connector (J6), or the bigger black one (J1). J6 is labeled TS1 & TS2 +/-. The traces from the connector are routed via an inner layer, and I can just make them out on the top-side scan...

At least part of what he's saying makes sense, given the circuitry on the per-module management boards: Think of it this way.. From the negative terminal of the entire pack to the positive terminal, there are sixteen modules, and let's say 400V for a nice round number. From the per-module...