Portable Power Storage System

FIG. 1 is a front perspective view of a portable power storage system.

FIG. 2 is a rear perspective view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a front view thereof.

FIG. 5 is a right-side view thereof.

FIG. 6 is a left-side view thereof.

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

In these drawings, the solid lines illustrate the claimed ornamental design, whereas broken lines, if present, illustrate unclaimed subject matter and form no part of the claimed design.