The ornamental design for a portablechargingstoragecase, as shown and described.
FIG. 1 is a top perspective view showing the new design for a portable charging storage case.
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a left side view thereof; and,
FIG. 7 is a right side view thereof.
The broken lines in the drawings illustrate portions of the portable charging storage case which form no part of the claimed design. Shading is provided to illustrate contour only and is not an indication of texture, gloss, etc.