The ornamental design for a batterygrip for camera, as shown and described.
FIG. 1 is a front perspective view of a battery grip for camera showing our new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear 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; and,
FIG. 8 is a bottom view thereof.
The portions illustrated in dashed broken lines and the portions illustrated within dashed broken lines depict portions of the battery grip for camera which form no part of the claimed design.