I claim the ornamental design for a battery powered trimmer, as shown and described.
FIG. 1 is a right side perspective view of the battery powered trimmer;
FIG. 2 is a front view of the battery powered trimmer shown in FIG. 1;
FIG. 3 is a rear view of the battery powered trimmer shown in FIG. 1;
FIG. 4 is a left side view of the battery powered trimmer shown in FIG. 1;
FIG. 5 is a right side view of the battery powered trimmer shown in FIG. 1;
FIG. 6 is a top view of the battery powered trimmer shown in FIG. 1; and,
FIG. 7 is a bottom view of the battery powered trimmer shown in FIG. 1.
The subject matter shown in dashed lines, and any surfaces of the design not shown, including interior surfaces, form no part of the claimed invention.