In the present study, the hydrogen-absorption properties of the LaNi₅ and the La_0.7Ce_0.1Ga_0.3Ni₅ compounds were determined and compared. This work is therefore divided into two parts: an experimental part that presents and discusses the kinetics and isotherms of hydrogen absorption in the two compounds at two different temperatures (298 K and 318 K). In addition, the temperature variations inside the hydride bed were determined. In the second section, the experimental isotherms were compared to a numerical model processed using statistical physics. Following that, thanks to the perfect agreement between the experimental data and the proposed model, the stereographic and energetic parameters associated with the hydrogen absorption reaction, such as the number of hydrogen atoms per receptor site (n₁, n₂), the densities of the sites (N_m1, N_m2), the half-saturation pressures (P₁, P₂) and the absorption energies (ΔE₁, ΔE₂) for each receptor site, were calculated. All of these parameters are acquired by making numerical adjustments to the experimental data. Thermodynamic functions, such as internal energy and Gibbs energy, which regulate the absorption process, were then identified using these parameters. For both compounds, all of the aforementioned were compared and discussed in relation to initial temperature and pressure. The results demonstrated that the hydrogen-storage properties in LaNi₅ are enhanced by more than 30% of stored mass and kinetics when Ce and Ga are substituted at the La sites.