Battery charger

FIG. 1 is a front, top and left-side perspective view of the battery charger showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a back, bottom and right-side perspective view thereof.

The broken lines throughout the drawing figures depict portions of the battery charger that form no part of the claimed design.