The ornamental design for a ballteedevice, as shown and described.
FIG. 1 is an upper perspective view of the ball tee showing my new design;
FIG. 2 is a lower perspective view thereof;
FIG. 3 is a side elevational view thereof;
FIG. 4 is another side elevational view thereof, rotated 90° from FIG. 3;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The broken lines are included for the purpose of illustrating the portions of the ball tee that form no part of the claimed design. The appearance of any portion of the ball tee between the break lines forms no part of the claimed design.