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Are you getting any reboots with the 2x18650 cells that way while dueling or spinning?
That's do to the spring and inertia. It will get worse with use.That can be fixed with a strap of electrical tape across both cells or notch cut and velcro installed. Basically the contacts "enforce" the connection and the parallel hold cells in place.It's why Yoda's Graflex chassis include a velcro strap.