The ornamental design for a secondarybattery, as shown and described.
FIG. 1 is a perspective view of a secondary battery showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left-side elevational view thereof;
FIG. 5 is a right-side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is an enlarged cross section view thereof, taken along line 8-8 in FIG. 2.
The regulary spaced broken lines depict portions of the secondary battery that form no part of the claimed design. The dot-dash broken lines define the boundaries of the claim and form no part of the claimed design.