TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Device: The battery further comprises regenerating-plate module(s) having metal screen enclosed in a frame, which is thicker than the metal screen. The regenerating-plate module(s) and two air-plate modules are combined to constitute the battery, such that the frames of the regenerating-plate modules are clamped between the frames of the air-plate modules. The battery further comprises positive electrical lead, negative electrical lead, and regenerating lead connected to the metal anode, air cathode, and metal screen respectively. The battery may be formed by sequentially combining first air-plate module, first regenerating-plate module, metal-plate module, second regenerating-plate module and second air-plate module, or by sequentially combining first air-plate module, first metal-plate module, first regenerating-plate module, second metal-plate module, second regenerating-plate module, third metal-plate module and second air-plate module. Preferred Components: Each air cathode is attached to a separator, which allows air to flow while preventing short circuit. Four protruded portions are integrally formed on the four corners of the frame of each air-plate module. The frame of each air-plate module has air inlet path or air inlet cutout to allow the air to flow into the chamber. The frame of regenerating-plate module has air discharge path or air discharge cutout to allow oxygen and fumes to be discharged from the chamber. Each metal-plate module has electrolyte injection path or electrolyte injection cutout to allow the liquid electrolyte to be injected into the chamber. The frame of each metal-plate module has electrode slurry discharge path to allow electrode slurry to be discharge from the chamber. Preferred Method: A regenerating-plate module is produced by providing a piece of metal screen having two faces and providing two pieces of separator. The two separator is attached to each face of the metal screen, respectively. A piece of metal screen is separated from the roll of metal screen, and attached with frame. Each module is integrally formed.    TECHNOLOGY FOCUS - POLYMERS - Preferred Method: Each piece of film is made of polyester or polyamide.