internal balance ports are not that good as you are limited just to JST-XH balance tap. with chargers that have external balance board connector you can use board for whichever balancing taps you have (JST-XH, JST-EH, Hyperion/PQ, Flightpower)

however there is a way how to connect external boards to 206b - amainhobbies have an adapter harness that allows connection of standard 2S-6S boards