Dissociation conditions of hydrogen semiclathrate hydrates with tetrabutylammonium chloride (TBAC) are measured using a differential scanning calorimeter at the TBAC weight fraction of 0.10, 0.20, 0.35, and 0.50 in the pressure range up to 15.5 MPa. The hydrogen storage capacity of TBAC semiclathrate hydrate is estimated with measured equilibrium data, dissociation enthalpies, and the Clapeyron equation. The amount of hydrogen stored in the semiclathrate hydrate is found to be 0.11 wt % at 15.5 MPa. The model proposed by Paricaud [J. Phys. Chem. B 2011, 115, 288-299] is applied to predict the dissociation condition of the H2 semiclathrate hydrate with TBAC. The parameters in the model have been determined by describing the liquid-vapor-hydrate three phase lines measured in this work and from the literature. The hydrogen storage capacity predicted by the model is in excellent agreement with the experimental value.