I fly race quads and the batteries I run are GnB 6s 1100 mAh 130c rated but I can tell you right now that C rating is mostly just guess work by the manufacturers and means nothing tbh. Not to mention, even if your batteries could supply “8000 watts” it doesn’t mean that your motors and speed controllers can, and and that’s before factoring inefficiency losses.
Oh also the idea of lipos pushing that many amps in a backpack via a tether to your board is terrifying. Good luck with that 
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