Why can't you run your 6s packs on one? make it 12s. Or even better yet run 10s and make 2 pairs of packs with your 6 and 4s and you can charge one set while your driving the other. I have run the 3994 on 12s and its a monster, motor, batt and esc temps all under 100F after a full set of packs (2x6s/5ah) and will drive a 50+mm prop, the X447 I had on it did almost nothing and the 450/3 still didn't get it over 105F. Make sure you get a decent size hull if you try it tho, its is way too much for anything but saw use in anything under 40" imo.
6BOOST
6BOOST
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