Ammonium borohydride (ABH2) has been studied as a hydrogen storage material, it stores hydrogen on both cationic and anionic sites and has the largest gravimetric and volumetric storage densities yet reported. Before decomposition ABH2 undergoes three phases changes, we ask for 3 days on TOSCA to study the molecular motions of these phases, the transitions between them and the changes as the material approaches decomposition.