Abstract: In recent years, with the development of power battery technology, an increasing number of manufacturers have favored lithium batteries as forklift power sources. However, there has been a lack of relevant research on the safety performance of lithium batteries for forklifts, especially on the nondestructive inspection of faulty batteries, which is rarely performed. Therefore, this study adopted high-resolution industrial computed tomography (CT) to study faulty lithium batteries for forklifts, scanning the internal structure and analyzing the relationship between the performance attenuation of the lithium battery and the internal structure, thereby combining with the charging and discharging conditions, to provide a solution for the nondestructive inspection of lithium batteries in forklifts.