The ornamental design for the battery connector, as shown and described.
FIG. 1 is a perspective front view of a battery connector of a battery in accordance with an embodiment of the present invention;
FIG. 2 is a perspective left side view of the battery connector of the battery of FIG. 1;
FIG. 3 is a front view of the battery connector of the battery of FIG. 1;
FIG. 4 is a rear view of the battery connector of the battery of FIG. 1, obscured by the battery;
FIG. 5 is a left side view of the battery connector of the battery of FIG. 1;
FIG. 6 is a right side view of the battery connector of the battery of FIG. 1;
FIG. 7 is a top view of the battery connector of the battery of FIG. 1; and,
FIG. 8 is a bottom view of the battery connector of the battery of FIG. 1.
The broken lines of the battery connector and the battery in FIGS. 1-8 are illustrative of the visible environmental structure of the battery connector and form no part of the claimed design.