 This paper proposes a novel battery management system for mobile music speakers, which optimizes reliability through dynamic redundancy. It uses a fault-tolerance structure to allocate power from multiple batteries in order to maximize the overall runtime of the device. Simulation results show that the proposed system extended the runtime by 18.75%, while also improving the energy utilization rates of individual batteries. This article is authored by Xiaofei Yu, Yan Kli, Xiaomin Li, and others.