Provided is a metal oxygen battery 1 including a positive electrode 2 having oxygen as an active material, a negative electrode 3 having metallic lithium as an active material, and an electrolyte layer 4 interposed between the positive electrode 2 and negative electrode 3. By further using predetermined relations between mechanical input power and flow rate through the pump or fan, a measure of the flow rate can be derived without use of in-line flow or pressure sensors. Between the front exhaust pipe opened to the inside of the expansion chamber and the rear exhaust pipe, a water-controlling plate is provided in an upper side of the expansion chamber. The liquid handling structure of the present invention has a basis weight to uncompressed caliper ratio of less than 100 grams per square meter per millimeter. The interface includes a second option to publish data to a specific file format, location specific database, location specific message queue, data stream on the world wide network, a file format at an internet URL, a specific database at an internet URL, a message queue at an internet URL. This material has improved gas permeability and improved flexibility properties.