Mobile power supply system with a fuel cell

The power supply unit housing (110) has respective housing sections receiving at least one fuel cell device (140), an electrical consumer and a fuel tank (120b) or a replaceable fuel cell cartridge. The housing may have a connection (120a) for coupling to an external fuel feed and at least one connection terminal (130a,130b) for an electrical consumer. An Independent claim for a mobile power supply system is also included.