Axion Power International, Inc. was an energy technology firm dedicated to the engineering and production of cutting-edge lead-carbon (PbC) battery technology. These advanced batteries were tailored for a wide range of uses, encompassing large-scale energy storage, integrating renewable power grids, standalone off-grid systems, and various automotive applications. Axion Power's proprietary PbC technology uniquely integrated the advantages of both lead-acid and supercapacitor designs.