This is the Hitec JST-XH Balance Board for X2 and X4 Hitec Chargers. This will work with the X2, X4 DC, and the X4 Plus AC/DC chargers. It has XH balance plugs for 2S, 3S, 4S, 5S, and 6S batteries.
Balance lead and ports for 2-6S LiPo battery packs
Connecting between charger and batteries