Cap for Battery

FIG. 1 is a top perspective view of a cap for battery, according to our new design; FIG. 2 is a bottom perspective view thereof; FIG. 3 is a front elevation view thereof; FIG. 4 is a rear elevation view thereof; FIG. 5 is a right side view thereof; FIG. 6 is a left side view thereof; FIG. 7 is a top plan view thereof; and, FIG. 8 is a bottom plan view thereof. The broken lines illustrate portions of the cap for battery that form no part of the claimed design.