TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: (I) comprises: 20-60 wt.% of (i); and 1-20 wt.% of (ii). (I) and the solid hydride-containing body further comprise: water (up to 20 wt.%); and at least one binder. (I) and the solid hydride-containing body are present as at least one of a tablet (preferred), a pellet, a flake and a granule. (I) is obtainable by compacting a solid mixture. Preferred Components: (i) comprises one or more of lithium borohydride, sodium borohydride, potassium borohydride, ammonium borohydride, beryllium borohydride (Be(BH4)2), magnesium borohydride (Mg(BH4)2), calcium borohydride (Ca(BH4)2), zinc borohydride (Zn(BH4)2), aluminum borohydride (Al(BH4)3), polyborohydride, dimethylamine-borane ((CH3)2NHBH3), sodium cyanoborohydride (NaCNBH3), lithium aluminum hydride (Li(AlH4)), lithium hydride, sodium hydride, magnesium hydride and calcium hydride. (ii) comprises one or more of lithium hydroxide, sodium hydroxide, potassium hydroxide, ammonium hydroxide, magnesium hydroxide, calcium hydroxide, barium hydroxide, zinc hydroxide and aluminum hydroxide. (i) has an average particle size of 0.005-3 mm. (ii) has an average particle size of 0.005-3 mm or 0.05-10 mm. At least parts of (i) and (ii) are present as a physical mixture. The mixture is obtained by compression under a pressure of 50-2000 kg/cm2. The hydride compound is present in combination with at least one of the solid alkaline compound and an alkaline aqueous liquid which is capable of dissolving the at least one solid hydride compound. In the fuel cell, a fuel chamber of the fuel cell comprises at least a part of the at least one hydride compound. The body is obtainable by a process which comprises compacting (I) comprising the solid hydride compound. The body further comprises the solid alkaline compound. The body comprises at least two parts. The tablet has at least two layers. At least one of the at least two parts comprises at least 70 wt.% of the at least one hydride compound, based on a total weight of the at least one part. At least one of the at least two layers comprises at least 70 wt.% of at least one alkaline compound, based on a total weight of the at least one layer. The body comprises at least a first layer which comprises at least 70 wt.% of at least one first hydride compound, based on a total weight of the first layer, and a second layer which comprises at least 70 wt.% of at least one second hydride compound which is different from the at least one first hydride compound, based on a total weight of the second layer. The body comprises a core and at least one layer which at least partially surrounds the core. The core comprises at least 70 wt.% of at least one first hydride compound, based on a total weight of the core, and the at least one layer comprises at least 70 wt.% of at least one second hydride compound which is different from the at least one first hydride compound, based on a total weight of the at least one layer. In the body, a solubility in water of the at least one second hydride compound is higher than a solubility in water of the at least one first hydride compound. The body comprises a water-soluble matrix which has particles of the at least one solid hydride compound dispersed in it. EXAMPLE - Typical composition comprised of (in %): sodium borohydride (10); potassium borohydride (53.8); and 90% potassium hydroxide (36.2).