Mine use the 4 pin balance lead for 3s and 3 pin balance for 2s

I ended up grabbing one of these guys https://www.amazon.com/dp/B07MQXBYZ5/ref=cm_sw_r_cp_apa_fabc_K8TNHKPCXBQE9P82MGVQ

Because the price was right, and it comes default with the Traxxas connection as well as having the 4 pin balance

I will probably see what my hobby shop has as well and grab a spare or two if the price is right, as well as some other parts and a lipo bag if they have them

I mostly just wanted to have at least one battery charged so that I can rip it around at the park near the hobby store