It's a Passport charger. It'll charge a 4s at 10 amps, and we are currently charging a 7200mah at 10 amps, so I'd like to cut the time in half by charging two of those at the same time, since the charger will still do 10 amps on 4s.

I guess the biggest confusion is that I don't know which wires are redundant or where they would all go on the new balance connector. Currently only one comes from the battery via a dedicated wire (the small bullet in the pic) and the one comes from each of the battery's main power connections.

When I remove the balance connector I will have

White from balance port
red from main positive
black from main negative

and two sets of those since it is two batteries