Melasta 8.4V 4200mAh 7-Cell Flat Pack NiMH Battery Compatible with Traxxas RC Racing Car Toys Hobbies : Amazon.ca: Toys & Games
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