FIG. 1 is a front perspective view of a battery pack showing the first embodiment of my new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a left side elevation view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof;
FIG. 9 is a front perspective view of a battery pack showing the second embodiment of my new design;
FIG. 10 is a rear perspective view thereof;
FIG. 11 is a front elevation view thereof;
FIG. 12 is a right elevation side view thereof;
FIG. 13 is a rear elevation view thereof;
FIG. 14 is a left side elevation view thereof;
FIG. 15 is a top elevation view thereof; and,
FIG. 16 is a bottom elevation view thereof.
The broken lines in the figures depict portions of the article which form no part of the claimed design.