Thermogravimetric analysis (TGA) is a powerful technique for screening boranes envisaged for chemical hydrogen storage. The demonstration is based on the use of six metal (II) chlorides (MCl2) (with M as 3d-metal or d(8)-metal) as destabilizing agents of solid-state hydrazine borane (N2H4BH3). On the basis of TGA profiles combined with derivative thermogravimetric (DIG) curves, it is shown that: e.g. (1) CuCl2 is an inefficient dopant whereas it is efficient towards ammonia borane (NH3BH3); (2) one of the best destabilization results is achieved with N2H4BH3 doped by 10 wt% CuCl2-NiCl2, the sample decomposing from 30 degrees C with greatly mitigated amounts of gaseous by-products; (3) in a few cases, the destabilization extent is so important that the doped samples could be envisaged as energetic materials. Above all, the present report shows the importance of TGA-DTG in the field of boron- and nitrogen-containing materials and the proposed protocol could be used by other groups so that literature-based comparisons are more relevant.