Yea, 20-30% sag sounds about right. I'm running #20 6v ( 120v) in a small truck 9" motor and I routinely sag to 100-106 on accel. and hills. I can only imagine what the Lipo's must be like with no sag. With a fresh top charge I get great accell which is VERY short lived untill the dreaded sag occurs. If you have the $$$$$ Lipo's are definately the way to go. Mind I'm not really unhappy with my lead, just droooooling over the Lipo's performance
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