The ornamental design for a batterycharger, as shown and described.
FIG. 1 is a perspective view from the right side of a battery charger.
FIG. 2 is a perspective view from the right side thereof.
FIG. 3 is a perspective view from the left side thereof.
FIG. 4 is a perspective view from the left side thereof.
FIG. 5 is a front elevation view thereof.
FIG. 6 is a rear elevation view thereof.
FIG. 7 is a right side elevation view thereof.
FIG. 8 is a left side elevation view thereof.
FIG. 9 is a top plan view thereof.
FIG. 10 is a bottom plan view thereof.
FIG. 11 is a referential view thereof with a connecting cord stored; and,
FIG. 12 is another referential view thereof with a connecting cord stored.
The portions of the battery charger shown in broken lines are for the purpose of showing environmental structure only and form no part of the claimed design.