... INTRODUCTION A power system composed of battery pack provides energy for other systems, and the reliability of this power system is very important. To analyze the reliability of the power system ... system reliability theory is conservative, and the proposed method in this paper is better to analyze the reliability of power systems. Keywords- power system; multi-state system theory; reliability; ... capacity of the battery. 2150()2~ 6000,150GNTo analyze the reliability of the system by the traditional system reliability theory, we must gain the reliability of the battery first. The power...