FIG. 1 is a perspective view of a battery charger showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is another perspective view thereof;
FIG. 9 is a perspective view the battery charger in an open state; and,
FIG. 10 is an enlarged view of the portion encircled in FIG. 1.
The broken line circle in FIGS. 1 and 10 is for the purpose of illustrating the boundary of the portion shown enlarged in FIG. 10, and forms no part of the claimed design. The remaining broken lines are for the purpose of illustrating portions of the battery charger that form no part of the claimed design.