FIG. 1 is a perspective view of a 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 top plan view thereof, the bottom plan view thereof being identical;

FIG. 5 is a right side view thereof, the left side view thereof being identical;

FIG. 6 is a sectional view thereof taken on line 6—6 of FIG. 2 showing no illustration of inside mechanism;

FIG. 7 is a referential view 1 showing a state in use thereof, the other battery charger and a noncontact battery charger shown in broken lines are for illustrative purposes only and form no part of the claimed design; and,

FIG. 8 is a referential view 2 showing a state in use thereof, a personal digital assistant (PDA) and a USB connector with a cable shown in broken lines are for illustrative purposes only and form no part of the claimed design.