The ornamental design for a portablechargingstation, as shown and described.
FIG. 1 is an isometric view of a portable charging station, showing our new design in an open configuration.
FIG. 2 is an isometric view of the portable charging station shown in a closed configuration.
FIG. 3 is a top plan view of the portable charging station shown in the open configuration.
FIG. 4 is a left side elevational view of the portable charging station shown in the open configuration.
FIG. 5 is a front elevational view of the portable charging station shown in the open configuration.
FIG. 6 is a top plan view of the portable charging station shown in the closed configuration.
FIG. 7 is a left side elevational view of the portable charging station shown in the closed configuration; and,
FIG. 8 is a front elevational view of the portable charging station shown in the closed configuration.
Stippling shown in the drawings are intended to represent the approximate three-dimensional contour of the design, and are not intended to indicate surface decoration. The broken lines in the figures are for illustrative purposes only and form no part of the claimed design.