TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The gas passage-permitting mechanisms comprise channel(s) interconnecting adjacent cells. Each channel has a hole in the gasket. They are arranged on one distal end of the frame. The hole is connected within the inside of the outer pressure tight seal in each cell. Guiding mechanism is provided in the gasket to control the position of the biplate during assembling of the battery. It comprises at least one boss, and/or rim (11) of the gasket. The gasket has a flexible feed-through as part of a pressure relief valve. The flexible feed-through has a channel that connects a gas space within the mounted battery with the ambient temperature. It is integrated with the gasket arranged adjacent to the endplate. The battery has a pressure relief-valve provided through endplate(s). A pin is held in placed by a retainer during operation. It is provided with extension(s). The retainer is shaped as the rim. It is a star washer. The battery has positive and negative terminal connectors adjustably arranged to the case.Preferred Method: The method includes filling the separators with the electrolyte, and performing greater than or equal to2 charging and discharging cycles. The battery is charged and discharged with or without a liquid supply attached to the passage. The filling step involves attached an electrolyte reservoir to the passage to the common gas space, evacuating air from the common gas space, filling electrolyte into the common gas space, and transferring electrolyte to each cell from the common gas space. The air is evacuated using an opening separate from the passage to introduce the electrolyte into the common gas space.Preferred Parameter: The flexible feed-through has size less than the size of an opening through the case and the pin having a size greater than the size of the channel in the feed-through.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Material: The liquid is water and/or electrolyte.    TECHNOLOGY FOCUS - METALLURGY - Preferred Material: The battery is NiMH, nickel and cadmium-containing compound (NiCd), or Ni zinc-containing compound (NiZn).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Material: The liquid is water and/or electrolyte.    TECHNOLOGY FOCUS - POLYMERS - Preferred Material: The material of deformable properties is elastic, preferably thermoplastic elastomer. The gasket is made via injection molding process.