Originally Posted by
gapjr
Hmmmmm....I have one of these esc's that does the exact same thing. I just thought it was dead but I was using lipos to try it out so today I'll try a standard 6 cell nimh on it and see what happens. I'll let you know

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I installed deans on two of these this weekend to run lipo and everything worked perfect. Didn't have to recalibrate or anything.
Did you try doing a recalibration?
What motor are you using?
Does your receiver have built-in BEC?