The ornamental design for a batterymodulebase, as shown and described.
FIG. 1 is a front top perspective view of an embodiment of the design for the battery module base;
FIG. 2 is a front side elevational view of the embodiment set forth in FIG. 1;
FIG. 3 is a rear side elevational view of the embodiment set forth in FIG. 1;
FIG. 4 is a right side elevational view of the embodiment set forth in FIG. 1;
FIG. 5 is a left side elevational view of the embodiment set forth in FIG. 1;
FIG. 6 is a top plan view of the embodiment set forth in FIG. 1; and,
FIG. 7 is a bottom plan view of the embodiment set forth in FIG. 1.
In the drawings, the solid lines illustrate the claimed ornamental design, whereas the broken lines illustrate environmental features that form no part of the claimed ornamental design.