[Kraeuterbutter]

@Pierre:
the thing with pinion was already mentioned here

another important thing:
your wires are too long

i mean the wires between motor and controller (also that is not that big of a problem)

AND the wires of batts to motor
(batts are side-by-side AND long wires)

--> in worst case it can destroy your controller !
so: try to make wires shorter !