In this comment, we would like to highlight errors in recently published papers in Journal of Electrochemical Society, which contain the results on O-2 solubility in a series of non-aqueous electrolytes; the articles address the influence of this electrolyte property on the performance of Li/air batteries. The effect of O-2 partition between the investigated electrolytes and the aqueous in-probe media had been neglected, though. This may be a source of substantial errors in determining O-2 solubility, and also may explain contradictions between reported works presenting data and values on O-2 solubility in non-aqueous electrolytes. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3568818] All rights reserved.