Alright, it's been a while but I finally tested all 3 so heres the results:
Intellect 8.4v 3600mah = 940rpm
intellect 7.2v 4200mah = 860rpm
intellect 8.4v 4200mah = 1020rpm
Although not exact, the rpm is very close to what it actually is, the 8.4 3600 and 7.2 4200 having an inaudible difference in rpm, but a very noticeable difference switching from the 8.4 4200 to the 7.2 4200.
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