FIG. 1 is a rear perspective view of a first embodiment of a portable power source showing the new design;
FIG. 2 is a front perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof;
FIG. 9 is a rear perspective view of a second embodiment of a portable power source showing the new design;
FIG. 10 is a front perspective view of the second embodiment;
FIG. 11 is a front view of the second embodiment;
FIG. 12 is a rear view of the second embodiment;
FIG. 13 is a left side view of the second embodiment;
FIG. 14 is a right side view of the second embodiment;
FIG. 15 is a top view of the second embodiment; and,
FIG. 16 is a bottom view of the second embodiment.
The broken lines in the figures depict portions of the portable power source that form no part of the claimed design.