To prevent casting defects of a multiple patterning lattice substrate for a storage battery having slanting lattice.

As a method of preventing casting defects of a multiple patterning casting lattice substrate that has a structure of two or more levels having slanting lattice for use of an electrode plate of a lead storage battery, there is a method in which the chamfering curvature radius is set to be ≥1.5 mm in the intersection between the vertical lattice of a substrate situated lowest in casting and the frame lattice of horizontal direction above the vertical lattice, and consequently is set it to be larger than the intersection of any lattice in the same substrate and other substrates, so that flowability is improved thereby preventing defects of the lattice. The chamfering curvature radius is set to be ≥1.5 mm for the lower corner of the intersection between the vertical lattice of the lattice substrate situated lowest in casting and the frame lattice of horizontal direction above the vertical lattice, and consequently is set to be larger than the chamfering curvature of corners in the intersections of the other lattice in all substrates.

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