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I run the zippy-h 5s 5000mAH 20c packs in my truggy and have for nearly a year racing and pushing hard w/o a single issue. I would have no problem saying the 6s 20c like mine would do the job. 6s is pretty hot though (fast), what motor are you running? I run the Neu 1515 2.5d (1650) and 5s is more than enough.. and a very safe voltage.