This is the TQ Wire 600mm XH Plug 3S Balance Extension Cable. TQ Balance extension cables use our flexible triple black 22 gauge cable material to relocate the balance plugs closer to you, making it easier to balance the pack in your car. The cables have either XH connectors (SMC, Orion type) or ThunderPower style plugs on both ends. Most are 600mm in length and plug into the balance board supplied with your charger.