Patent ID: 7427448

Claim:
A portable device including a fuel cell, the device comprising: a device housing having a plurality of outer walls; a proton conducting film which is disposed inside, and extends on and substantially parallel to at least one of said outer walls of, the device housing; catalyst layers disposed inside said device housing and on both sides of the proton conducting film in a thickness direction thereof; a removable fuel tank which is located inside said device housing in a storage portion ( 14 ) thereof having an opening for insertion of only the fuel tank, and which is physically separate from said proton conducting film; fuel of the fuel cell disposed on one of the catalyst layer sides of the proton conducting film; and an air chamber disposed inside said device housing and on the other of the catalyst layer sides of the proton conducting film for supplying air to the fuel cell, so that the fuel tank can be inserted and exchanged through said opening without disassembling of said device housing.