I'm not positive, but assuming the red connector is a JST plug, and the white JST-XH balance tap will connect to your charger or balance board, this may be an option.

This parallel charge cable and select JST-XH and 3S on this balance adapter. Another source here and here. Perhaps check with them first to help make sure everything connects up.

I don't see a parallel board that works with JST without doing the connectors or using adapters, a big board is possibly overkill for those batteries anyway. If interested look at the same sites, they have a large selection.