Battery Box for String Light

FIG. 1 is a perspective view of a battery box for string light showing my new design; FIG. 2 is another 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; FIG. 9 is a perspective view of the battery box for string light where the battery box for string light is in a first configuration of use; and, FIG. 10 is a perspective view of the battery box for string light where the battery box for string light is in a second configuration of use. The broken lines in the drawings depict portions of the battery box for string light, while additional broken lines shown in FIGS. 9 - 10 are directed to environment. The broken lines form no part of the claimed design.