An ornamentaldesign for a dc battery charger, as shown and described.
FIG. 1 is a left front upper perspective view of a DC battery charger according to the present design with the connection plug in the straight position;
FIG. 2 is a front view of the DC battery charger of FIG. 1;
FIG. 3 is a rear view of the DC battery charger of FIG. 1;
FIG. 4 is a left side view of the DC battery charger of FIG. 1;
FIG. 5 is right side view of the DC battery charger of FIG. 1;
FIG. 6 is a top view of the DC battery charger of FIG. 1;
FIG. 7 is a bottom view of the DC battery charger of FIG. 1; and,
FIG. 8 is a right front lower perspective view of the DC battery charger with the connection plug in the folded position.