I claim the ornamental design for a tool battery interface, as shown.
FIG. 1 is a perspective view of a portion of a tool.
FIG. 2 is a top view of the tool shown in FIG. 1; and,
FIG. 3 is a front perspective view of the tool shown in FIG. 1.
The present application is directed to the shape and contour of the battery interface portion of the design illustrated in the drawings. The broken lines shown in the drawings are included for the purpose of illustrating environmental structure and form no part of the claimed design. The dash-dot-dash lines shown in the drawings are included for the purpose of illustrating boundary lines and form no part of the claimed design.