The ornamental design for a portable powercharger with audio device, as shown and described.
FIG. 1 is a front elevation view of a portable power charger with audio device showing a new design;
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The broken lines shown in the figures are included for purpose of illustrating unclaimed portions of the portable power charger with audio device and form no part of the claimed design.