In advanced battery management systems, it is critical to incorporate an accurate battery model that captures the cells' dynamics in order to predict the battery performance. In this paper, a hysteresis model for a Lithium battery cell with improved transient response is proposed. In a battery cell, a hysteresis loop exists in a charge/discharge cycle resulting in an increased complexity in the cell behavior. The proposed model has the advantages of being simple and fairly accurate. The improvement in the transient response, which is observed during and after cell relaxation, has been verified experimentally by applying different charge and discharge tests data to the model. Model derivation and experimental verification are presented in this paper.