Portable Power Supply

FIG. 1 is a perspective view of a portable power supply showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings are included for the purpose of illustrating environmental structure and forms no part of the claimed design.