I would imagine that the only reason you are seeing a difference in voltage reading is that the two circuits measuring the voltage in the charger are not calibrated the same. There may be a slight increase in lead resistance on the balance lead as it's a smaller diameter cable, but over the distance involved it will be negligible.
As a safety feature, totally understand it.
Thinking further about it, I suspect the voltage measuring circuit on the balance port is just a better set of components compared to the main output circuit. nothing to do with volt drop or resistance of leads.
Last edited by Brighton27; 21-08-2017 at 05:48 AM.
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