The ornamental design for a battery eliminator, as shown.
FIG. 1 is a perspective view of a battery eliminator showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a side elevational view thereof;
FIG. 5 is an elevational view of the other side thereof;
FIG. 6 is a plan view thereof; and
FIG. 7 is a bottom view thereof.