The ornamental design for a “batter training device,” as shown and described.
FIG. 1 is a perspective view of a batter training device which embodies our new and original design therefore;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a left side elevational view thereof, the right side elevational view being a mirror image thereof; and,
FIG. 7 is a reduced scale perspective view showing the design in association with a bat, the broken line representation of the bat being for illustrative purposes only and forming no part of the claimed design.
The remainder of the broken lines shown in FIGS. 1–3, 6 and 7 are included for the purpose of illustrating portions of the batter training device that form no part of the claimed design.