Mobile Power Device

FIG. 1 is a front, left and top perspective view of a mobile power device showing our design; FIG. 2 is a rear, right and bottom 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; and, FIG. 8 is a bottom plan view thereof. The broken lines are included for the purposes of illustrating portions of the mobile power device that form no part of the claimed design.