In order to solve the problem of consistency after grouping of silver zinc battery, a multi-step FCM (MSFCM) algorithm is proposed for the separation of silver zinc battery. The method uses the clustering validity function to determine the optimal class number, two times of FCM sorting algorithm in optimal results, obtained classification results of different applications in the battery cycle life. Using the method of dynamic consistency life cycle, attenuation rate decreased significantly in the 30 cycle life test after the capacity decay rate does not exceed the idea of 10%.