Instead of developing a new battery to meet required specifications of an automotive battery pack, different batteries can be combined to construct a hybrid battery module to simultaneously achieve both high power and high energy densities in a single system. To investigate the feasibility of battery hybridization concept, a circuit‐based hybrid battery model similar to physics‐based, blended‐electrode model is developed. Our simulation results confirm that the hybrid battery model shows good agreement with physics‐based model. Prototype hybrid battery modules consisting of two different lithium‐ion batteries are constructed according to various configurations. A computational model representing the constructed hybrid battery module is developed for model validation. Our experimental results show that the capacity and power of a battery module can be controlled by combining different batteries. The computational model of the hybrid battery shows good agreement with experimental results, confirming high fidelity of the proposed model.