A method of fabricating a rechargeable battery is described. The method comprises of (A) laminating an anode slurry and a cathode slurry separately on an upper surface and a lower surface of a substrate having two-sided metallic laminae, so as to construct a dual-collector electrode; (B) forming a package component using a printed circuit substrate; and (C) using the package component to compact an electrolyte and at least a core component of a secondary cell into an inner space of the package component, wherein the core component comprises the dual-collector electrode.