Motor shield v3 voltage

Hi,

What's the maximum voltage for dc motors the motor shield v3 can handle if vin-connect is cut through?

IMHO the stated 18V from the spec must been wrong as the controller on the board can handle >40V.
It's not entirely clear if 18v is for connected or cut vin-connect.
From the motor shield schematics all parts in the power path are between 35 and 40v.

Ps.: I'd need about 25V for my motors.

Michael