Traxxas batteries suck from my experience always puffed for me. I’ve been using these and I’m happy with them. Price isn’t too bad either PowerHobby 3S 11.1V 5200mAh 50C Lipo Battery W XT60 Plug + Adapter 3-Cell Compatible with : Slash 4x4 4WD 2WD Stampede Rustler E-Revo E-Maxx Spartan M41 X-Maxx Brushless VXL https://www.amazon.com/dp/B07N2CWD78/ref=cm_sw_r_cp_api_i_3RJRNCFCYA3FDV79WDT4