The ornamental design for a battery-operated toothbrush, as shown and described.
FIG. 1 is a front, top and left side perspective view of a first embodiment of a battery operated toothbrush;
FIG. 2 is a front elevational view thereof:
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a rear side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a front, top and left side perspective view of a second embodiment of a battery operated toothbrush;
FIG. 9 is a front elevational view thereof:
FIG. 10 is a right side elevational view thereof;
FIG. 11 is a rear side elevational view thereof;
FIG. 12 is a left side elevational view thereof;
FIG. 13 is a top plan view thereof; and,
FIG. 14 is a bottom plan view thereof.
Broken lines are used in the drawings to designate environmental structures, or parts of a battery-operated toothbrush, that form no part of the claim.