| Summary: | The greenhouse emissions are biggest challenge of the present era. The renewable power sources are required to have characteristics of good charge capacity, energy density with proven charging discharging cycles for energy storage and applications. Mg-air batteries (MABs) are an alternative renewable power source due to their inexpensive cost. In particular, the previous reports presented the metal-air battery structure, with a specific energy overall output of 765 W h kg<sup>−1</sup>. This paper is focused mainly on the MAB, which employed nanocomposite polymeric electrodes with a proven energy density of 545 W h kg<sup>−1</sup> and a charge capacity of 817 mA h g<sup>−1</sup> when electrolyzed at a cycling current density of 7 mA cm<sup>−2</sup>.
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