This charge adapter allows you to plug a battery that uses a standard JST XH balance connector into a THunder Power style battery charger. The adapter plugs into the 6-cell balance port on the charger, and breaks out into the 2S, 3S, 4S, 5S and 6S JST XH connectors. With this adapter, you get a "One size fits all" adapter that will work with any battery from 2 cells up to 6 cells.