PURPOSE: To make it possible to assure the lighter weight, stronger reinforcement and good bendability of the grids of batteries by constituting a core material of a high tensile strength fibrous material, etc. of a composite wire coated with an extrudible, corrosion-resistant metal.

CONSTITUTION: For example, the core material 86 of high tensile strength fibrous material, optical glass fiber or metallic wire having good electrical conductivity, etc. for the grids of the batteries is composed of the composite wire 100 of the extrudible, corrosion-resistant metal, for example, lead, zinc or nickel. As a result, the decrease in the weight of the grids of this kind, the intensification of the strength and the good bendability are assured. Even more, the composite cable is constituted by using a plurality of such composite wires 100, by which the composite cable optimum for use as, for example, a slow blow fuse of high current is provided.