Many believe it is right around the 8V mark. The highest voltage most people put into their Xmods is either a 7.4V LiPo pack or 7.2V with a six cell upgrade using all NiMH batteries. There have been some cases of a seven cell NiMH car running at 8.4V and lasting for a while; when going to 8.4V you're really pushing that limit.
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