Mini fuel cell battery with screw-closure system

A mini fuel cell battery comprising at least one battery module, each battery module comprising: a body unit (1); and at least two fuel cell units which are disposed to the body unit (1) and define an anodic space (15) therebetween, wherein each fuel cell unit comprises a pair of collectors (3, 4), a membrane electrode assembly (6) which is disposed between the pair of collectors (3, 4), and a fixing ring (2) which is secured to the body unit (1) by means of a screw-closure system, such as hermetically to seal the respective fuel cell unit to the body unit (1).