In the fast-growing electric vehicle (EV) industry, key technology challenges include the improvement of battery efficiency, reliability, and endurance. In this paper, we propose a novel battery pack design methodology that supports dynamic reconfiguration of the battery pack architecture, which partitions the battery modules into the primary group and secondary group. The proposed reconfigurable design effectively improves the battery pack reliability and endurance, especially for battery packs that contain modules with uneven aging conditions. Simulation results show that, with our approach, the equivalent average aging speed among all battery modules is slowed down, and the battery pack's endurance is increased.