Traxxas EZ-PEAK LIVE 2971 Charger with (2) 14.8v 4S 2890x Batteries X-MAXX 20334299307 | eBay
Amazon.com: Traxxas 2996X - Power Cell 4S 14.8V Lipo Battery / iD Charger Completer Pack : 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
6700mah 14.8v 4-Cell 25C LiPo Battery | Traxxas
Higher Battery Mount Tray Lift Lipo 4s Hardcase For Traxxas X-MAXX - murat-rc