GForce 25C 8400mAh 3S 11.1V LiPO Fits TRX RC Slash VXL, Spartan Traxxas TRA2878 Direct replacement for the TRA2878 Capacity: 8400mAh 3S - 11.1V - 25C Discharge Rate 159mm x 45mm x 45mm(6.3in x 1.8in x 1.8in) Would fit Slash VXL, Slash 4x4 VXL, and Spartan models.