This paper presents a preliminary simulation study of Lithium-ion batteries. The dynamic model of Li-ion batteries was created and the model was validated with previous results for different temperatures. It found that the developed model produce the results acquired with previous results. The Li-ion battery characteristics were simulated as voltage profiles for two different condition of initial State of Charge (SOC) and for two different values of temperature. The usable operating time and the battery were found to vary with SOC initial and temperature. It is also found that the usable run time of the battery increases with increase in SOC initial and decrease in temperature. The Li-ion discharge battery model was simulated for the Hybrid electrical Vehicle (HEV). The simulation results give a framework of a nonlinear dynamic performance of the Li-ion battery pack for the electrical scooter. © 2013 IEEE.