NOVELTY - Closed reactor for generation of hydrogen gas from a chemical hydride comprises a reaction vessel; at least one entry port; and an outlet port for outputting hydrogen gas.    USE - The closed reactor or unit form of composition is useful for generation of hydrogen gas from chemical hydride or for generating hydrogen gas in fuel cell apparatus (all claimed).    ADVANTAGE - Reconfigurable and flexible fuel cell apparatus is provided. The plug-and-play configuration makes the fuel cell apparatus highly advantageous in portable applications, since the apparatus can be dismantled and/or packaged for transportation. For example, the blades can be disconnected from the control unit and stacked on top of one another during transportation and then reconnected to the control unit for deployment of the apparatus. Moreover, the flexible configuration allows for the implementation of different control algorithms within a single flexible architecture.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a hydrogen generator comprising a first reactor comprising the reactor above; a first dosage device in communication with an entry port of the first reactor; and a first hydrogen outlet in communication with the outlet port of the first reactor which is connectable to a fuel cell apparatus;    (2) a fuel cell array comprising membrane electrode assemblies (MEAs) each having a major planar surface, where the MEAs are arranged such that a first surface of a first MEA which is not a major planar surface of the first MEA faces a second surface of a second MEA which is not a major planar surface of the second MEA;    (3) a fuel cell apparatus comprising a control unit; and fuel cells arranged in a blade, where the blade is connected externally to the control unit; or a fuel cell apparatus comprising a first fuel cell array and a second fuel cell array which are movable with respect to each other between a first configuration and a second configuration, where the second configuration is more compact than the first configuration;    (4) a unit form of a composition comprising a chemical hydride, where the unit form has a volume of at least 0.01 cm3; and    (5) a method for generation of hydrogen in a fuel cell apparatus, involving contacting a unit form of a composition comprising a chemical hydride with water.