Loosing my mind

Hey All, I’m converting some chinese boards, bought a flipsky 752 and 75300 a 65111 and 65161 with vx3 remotes, i built a waterproof channel track for 65111, i will post STL’S later. i am trying to use the batteries i had and not having much luck, they 13 48v 30 ah, and i cannot seem to make my esc’s think i have any poer, it powers the esc, but not the motor, any one know something?