I bought these for my XMaxx. They come with TRX Connectors on them. I don't like Traxxas batteries or chargers. I have a hobbymate charger and adaptors to charge these. I have the small adaptors on my slash 4x4 and my stampede 2wd
https://www.amazon.com/dp/B081SBN3H1/ref=cm_sw_r_cp_apa_fabc_5D1Y37NVQ0J14EZY1M0B?_encoding=UTF8&psc=1