Use this with your charger to balance charge batteries that have the traxxas id connector installed.nOne end of the cable plugs directly into a chargeru0026#39;s 4mm output ports and the 3s or 2s balance port. **.nThe other end of the adapter plugs into a traxxas id batteryu0026#39;s connector. Like tra2938.nLength: aprox. 27cm, 10″ | charging wires: 18awg | balance wires: 22awg | balance plugs: jst-xh.n**note: if your charger does not use 4mm output ports to charge, but rather charges through the balance port, please do not purchase this cable as it will present the possibility of crossing the positive and negative bullet plugs since they will not be plugged into anything. Instead, purchase the gtp0212 or the gtp1212 adapter. Search amazon for these part numbers.n