FIG. 1 is a top perspective of a battery charger showing our new design, wherein a cover is depicted in a closed position;

FIG. 2 is a front view thereof, wherein the cover is depicted in the closed position;

FIG. 3 is a rear view thereof, wherein the cover is depicted in the closed position;

FIG. 4 is a right side view thereof, wherein the cover is depicted in the closed position;

FIG. 5 is a left side view thereof, wherein the cover is depicted in the closed position;

FIG. 6 is a top view thereof, wherein the cover is depicted in the closed position;

FIG. 7 is a bottom view thereof, wherein the cover is depicted in the closed position;

FIG. 8 is a top perspective of the battery charger, wherein the cover is depicted in an open position;

FIG. 9 is a front view thereof, wherein the cover is depicted in the open position;

FIG. 10 is a rear view thereof, wherein the cover is depicted in the open position;

FIG. 11 is a right side view thereof, wherein the cover is depicted in the open position;

FIG. 12 is a left side view thereof, wherein the cover is depicted in the open position;

FIG. 13 is a top view thereof, wherein the cover is depicted in the open position; and,

FIG. 14 is a bottom view thereof, wherein the cover is depicted in the open position.

The broken line showing is included for the purposes of illustrating environmental features and forms no part of the claimed design.