The ornamental design for a battery, as shown and described.
FIG. 1 is a front, top and right side perspective view of a battery showing our new design;
FIG. 2 is a rear, top and left side perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a right side view thereof.
The features shown in broken lines in the drawings depict environmental subject matter only and form no part of the claimed design. The dashed-dotted lines denote the boundary of the claim and form no part of the claimed design.