I claim the ornamental design for a battery cell spacer, as shown and described.
FIG. 1 is a perspective view of a battery cell spacer;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a top view of FIG. 1;
FIG. 4 is a bottom view of FIG. 1;
FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. 2;
FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. 2; and,
FIG. 7 is a cross-sectional view taken along line 7-7 of FIG. 2.
The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design.