Battery expansion pack

FIG. 1 is a front perspective view of a battery expansion pack;

FIG. 2 is a back perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left-side view thereof;

FIG. 6 is a right-side view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is a front perspective view thereof, shown with a camera and mount installed;

FIG. 10 is a back perspective view thereof; and,

FIG. 11 is a left-side view thereof.

The broken lines showing the camera and mount in FIGS. 9 - 11 illustrate environmental structure. All other dash-dash broken lines illustrate portions of the battery expansion pack. The dot-dashed broken lines represent boundaries of the claimed design. None of these broken lines form part of the claimed design.