Hey thanks, - yeah I looked at all of those earlier. I guess I should describe my confusion in more detail:

The manual does not say anything about wiring the two balance ports together. Also in that youtube video where the German guy is sync charging his 4010, he does NOT have his balance ports wired together - he is only balancing out of the one port.

I am confused as to why they sell connected balance wires. I would think you would just have the one balance cable coming out of the port that is doing the charging.

So my question is for anyone who has sync charged on an icharger duo 308 406 or 4010: did you wire your balance port together or not?