The ornamental design for a mobilebattery, as shown and described.
FIG. 1 is a front view of an embodiment of a mobile battery;
FIG. 2 is a left side view of the embodiment of FIG. 1;
FIG. 3 is a rear side view of the embodiment of FIG. 1;
FIG. 4 is a top view of the embodiment of FIG. 1;
FIG. 5 is a bottom view of the embodiment of FIG. 1;
FIG. 6 is a front perspective view of the embodiment of FIG. 1;
FIG. 7 is a perspective view showing the embodiment of FIG. 1 in an alternate position; and,
FIG. 8 is a perspective view showing the embodiment of FIG. 1 in another alternate position.
The broken lines shown in the drawings are included for the purpose of illustrating portions of the mobile battery that form no part of the claimed design.