FIG. 1 is a left perspective view of a USB battery charger showing my new design;
FIG. 2 is a right perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 is a perspective view of the design, showing the use thereof.
The broken line showing is included for the purpose of illustrating environment features and forms no part of the claimed design.