The present invention relates to a metal M-air (O 2 ) battery cell comprising a non-aqueous electrolyte medium with an Organic Multi Redox Mediator (OMRM) compound comprising at least two different reversible Organic Redox Mediator Center terminations ORMC1 • and ORMC2, as a soluble organic catalyst. The invention also concerns a method for preparing such a compound and the use of such a compound as a soluble organic catalyst in a metal M-air battery cell. The invention also concerns a battery pack comprising at least two metal M-air battery cells according to the invention. The use of a battery pack according to the invention as a rechargeable battery for electric vehicles and hybrid vehicles, electronic devices, and stationary power generating devices, is also part of the invention. Finally, the invention is directed at a vehicle, an electronic device, and a stationary power generating device, and preferably devices related to mobility such as cars, bikes, scooters and drones, comprising a battery pack according to the invention.