The ornamental design for a batterypack for a camera, as shown and described.
FIG. 1 is a front perspective view of a battery pack for a camera showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a left side view thereof; and,
FIG. 7 is an enlarged view thereof, portion “7” shown in FIG. 1.
In the drawings, the dash-dash broken lines illustrate portions of the battery pack for a camera which form no part of the claimed design. The dash-dotted lines illustrate a boundary of the claimed design, and enlarged view indicator and form no part thereof.