We claim the ornamental design for a battery pack, as shown and described.
FIG. 1 is a front perspective view of a battery pack according to another embodiment of the invention.
FIG. 2 is a first side view of the battery pack of FIG. 1.
FIG. 3 is a second side view of the battery pack of FIG. 1.
FIG. 4 is a top view of the battery pack of FIG. 1.
FIG. 5 is a bottom view of the battery pack of FIG. 1.
FIG. 6 is a front view of the battery pack of FIG. 1; and,
FIG. 7 is a rear view of the battery pack of FIG. 1.
The portions of the battery pack shown in broken lines are included for the purpose of illustrating environment and form no part of the claimed design.
The dot dash broken line shown in the figures represents the boundary of the claimed design. The dot dash line itself forms no part of the claimed design.