Powerhead for a battery-powered wet/dry vacuum cleaner

The design is the features of shape, configuration and ornament of the portions of the VACUUM CLEANER as shown in solid lines in the drawings. The portions shown in dashed lines do not form part of the design. Drawings of the design are included. FIG. 1 is a front perspective view of a vacuum cleaner showing the design; FIG. 2 is a front view thereof; FIG. 3 is a rear view thereof; FIG. 4 is a right side view thereof; FIG. 5 is a left side view thereof; and FIG. 6 is a top view thereof.