Traxxas 6726X Battery Tray Expansion Set for Rustler 4x4 – Blasted RC
Biggest batteries I've found to fit in the stock XRT battery tray are these HRB 9500mah 4s 120c packs. The Lectron pro 5200's the hobby sold me are way too small. These
Amazon.com: Raidenracing V2 Version Alloy Aluminium Extend 3S 2S Battery Holder Tray Plate for V2 Traxxas Rustler 4wd VXL 4X4 (Long Wheelbase) : Toys & Games
Traxxas Rustler 1/10 RTR Stadium Truck w/XL-5 ESC, TQ 2.4GHz Radio, Battery & DC Charger, LED Lighting (Blue) - Small Addictions RC