The ornamental design for a portablechargingdevice, as shown and described.
FIG. 1 is a front-side perspective view showing a portable charging device in accordance with the present invention;
FIG. 2 is a rear-side perspective view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom view showing a portable charging device in accordance with the present invention;
FIG. 5 is a side view thereof; and,
FIG. 6 is a front-side perspective view showing a portable charging device in accordance with a second embodiment.
The broken lines shown in the drawings depict environmental structure and portions of the portable charging device which form no part of the claimed design.
The device is not limited to the scale depicted herein.