Portable Power Supply

FIG. 1 is a front, right and bottom perspective view of a portable power supply, showing our design. FIG. 2 is a rear, left and top perspective view thereof. FIG. 3 is a front elevation view thereof. FIG. 4 is a rear elevation view thereof. FIG. 5 is a left side elevation view thereof. FIG. 6 is a right side elevation view thereof. FIG. 7 is a top plan view thereof. FIG. 8 is a bottom plan view thereof. FIG. 9 is an enlarged view of the detail 9 in FIG. 2 ; and, FIG. 10 is an enlarged view of the detail 10 in FIG. 2 . The broken lines depict portions of the portable power supply that form no part of the claimed design. The dot-dash broken lines in FIGS. 2 , 9 and 10 depict the boundaries of the enlargements that form no part of the claimed design.