in my experience, hard cased li-po's are not adversely affected from the rigors of off-road racing. I have used them extensively in the B4 and Lazer ZX5.
i have also borrowed a good, matched set of 4200's as a comparison to Li-po's and the power delivery of the 4200's felt better than the li-po's top speed was about the same, so i would say if you buy decent nimih's (like most of you do) you are not at a disadvantage to the Team Orion 3200 lipos at least. I am awaiting my new 3600 orions for the forthcoming season.
Prior to using the Lipo's I was running Demon GP3700's and the 3200mah Lipos out performed them in every category!
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