FIG. 1 is a top perspective view of a first embodiment of a battery pack of the present invention;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a first side view thereof;

FIG. 5 is a second side view thereof;

FIG. 6 is a front view thereof;

FIG. 7 is a rear view thereof;

FIG. 8 is a top perspective view of a second embodiment of a battery pack of the present invention;

FIG. 9 is a top view thereof;

FIG. 10 is a bottom view thereof;

FIG. 11 is a first side view thereof;

FIG. 12 is a second side view thereof;

FIG. 13 is a front view thereof;

FIG. 14 is a rear view thereof;

FIG. 15 is a top perspective view of a third embodiment of a battery pack of the present invention;

FIG. 16 is a top view thereof;

FIG. 17 is a bottom view thereof;

FIG. 18 is a first side view thereof;

FIG. 19 is a second side view thereof;

FIG. 20 is a front view thereof;

FIG. 21 is a rear view thereof;

FIG. 22 is a top perspective view of a fourth embodiment of a battery pack of the present invention;

FIG. 23 is a top view thereof;

FIG. 24 is a bottom view thereof;

FIG. 25 is a first side view thereof;

FIG. 26 is a second side view thereof;

FIG. 27 is a front view thereof;

FIG. 28 is a rear view thereof;

FIG. 29 is a top perspective view of a fifth embodiment of a battery pack of the present invention;

FIG. 30 is a top view thereof;

FIG. 31 is a bottom view thereof;

FIG. 32 is a first side view thereof;

FIG. 33 is a second side view thereof;

FIG. 34 is a front view thereof;

FIG. 35 is a rear view thereof;

FIG. 36 is a top perspective view of a sixth embodiment of a battery pack of the present invention;

FIG. 37 is a top view thereof;

FIG. 38 is a bottom view thereof;

FIG. 39 is a first side view thereof;

FIG. 40 is a second side view thereof;

FIG. 41 is a front view thereof; and,

FIG. 42 is a rear view thereof.

The ornamental design which is claimed is shown in solid lines in the drawings. Any broken lines in the drawings are for illustrative purposes only and form no part of the claimed design.