Headphone charging case

FIG. 1 is a perspective view of a headphone charging case showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a back 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 a perspective view of the headphone charging case in open state; and,

FIG. 10 is another perspective view thereof.

The broken lines depict portions of the headphone charging case that form no part of the claimed design.