Mike, you'll be fine using LiPo's instead of NiMH's, the only caveat will be that it won't have a low-voltage cut-off built in, so you'll either have to be careful to not run the batteries down too low (<6v), or add a seperate LiPo cut-off for peace of mind. I was running LiPo's with a 25 year old Lazer Bug ESC with no issues.
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