FIG. 1 is a bottom, front right side perspective view of a battery for portable electronic device, showing my new design;
FIG. 2 is a top, front right side perspective view thereof;
FIG. 3 is a bottom, rear left side perspective view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a right side view thereof;
FIG. 8 is a top view thereof;
FIG. 9 is a bottom view thereof; and,
FIG. 10 is a front view thereof, shown in an environment of use.
The broken lines in FIGS. 1-9 represent portions of the article which form no part of the claimed design. The remaining broken lines in FIG. 10 represent environmental subject matter which forms no part of the claimed design.