A metal/air battery with an oxygen management system, comprising: a negative electrode; a positive electrode; a separator positioned between the negative electrode and the positive electrode; an oxygen separations unit; an oxygenated gas supply reservoir; at least one valve (180, 182, 184, and 186) fluidly coupled to the oxygen separations unit, the oxygenated gas supply reservoir, and the positive electrode and, during a discharge cycle, configured to: selectively place the oxygen separations unit in fluid communication with the positive electrode, selectively place the oxygenated gas supply reservoir in fluid communication with the positive electrode; a first valve of the at least one valve (180, 182, 184, and 186) that selectively places the oxygen separations unit in fluid communication with the positive electrode, a second valve of the of the at least one valve (180, 182, 184, and 186) that selectively places the oxygenated gas supply reservoir in fluid communication with the positive electrode; and a compressor with an outlet fluidly coupled to the oxygenated gas supply reservoir; and a third valve of the at least one valve (180, 182, 184, and 186) fluidly coupled to the oxygen separations unit and to an inlet of the compressor and configured to selectively place the oxygen separations unit in fluid communication with the oxygenated gas supply reservoir via the compressor. a negative electrode; a positive electrode; a separator positioned between the negative electrode and the positive electrode; an oxygen separations unit; an oxygenated gas supply reservoir; at least one valve (180, 182, 184, and 186) fluidly coupled to the oxygen separations unit, the oxygenated gas supply reservoir, and the positive electrode and, during a discharge cycle, configured to: selectively place the oxygen separations unit in fluid communication with the positive electrode, selectively place the oxygenated gas supply reservoir in fluid communication with the positive electrode; a first valve of the at least one valve (180, 182, 184, and 186) that selectively places the oxygen separations unit in fluid communication with the positive electrode, a second valve of the of the at least one valve (180, 182, 184, and 186) that selectively places the oxygenated gas supply reservoir in fluid communication with the positive electrode; and a compressor with an outlet fluidly coupled to the oxygenated gas supply reservoir; and a third valve of the at least one valve (180, 182, 184, and 186) fluidly coupled to the oxygen separations unit and to an inlet of the compressor and configured to selectively place the oxygen separations unit in fluid communication with the oxygenated gas supply reservoir via the compressor. selectively place the oxygen separations unit in fluid communication with the positive electrode, selectively place the oxygenated gas supply reservoir in fluid communication with the positive electrode; a first valve of the at least one valve (180, 182, 184, and 186) that selectively places the oxygen separations unit in fluid communication with the positive electrode, a second valve of the of the at least one valve (180, 182, 184, and 186) that selectively places the oxygenated gas supply reservoir in fluid communication with the positive electrode; and a compressor with an outlet fluidly coupled to the oxygenated gas supply reservoir; and a third valve of the at least one valve (180, 182, 184, and 186) fluidly coupled to the oxygen separations unit and to an inlet of the compressor and configured to selectively place the oxygen separations unit in fluid communication with the oxygenated gas supply reservoir via the compressor.