I claim the ornamental design for the transportation plug for battery cases, as shown and described.
FIG. 1 is a perspective view of the transportation plug for battery cases.
FIG. 2 is a front elevational view of the transportation plug for battery cases.
FIG. 3 is a right side, elevational view of the transportation plug for battery cases.
FIG. 4 is a left side, elevational view of the transportation plug for battery cases.
FIG. 5 is a rear elevational view of the transportation plug for battery cases.
FIG. 6 is a top plan view of the transportation plug for battery cases; and,
FIG. 7 is a bottom plan view of the transportation plug for battery cases.
The portions of the transportation plug for battery cases shown in broken lines are for the purpose of illustrating unclaimed portions, and form no part of the claimed design.