Battery management hardware platform for LiMn2O4 power batteries group was built, based on features of car battery series charge-discharge. A novel batteries group management method was presented. Every power battery voltage, temperature and current will be detected by the centralized detection system, and use CAN communications to transfer data to touch screen microprocessor. The data of detection will be analyzed and dealt with, battery charger and motor controller will be monitored and controlled by touch screen microprocessor too. This will discover rapidly behind the battery, and avoid power battery overcharge and over discharge. The reliability and practicality of LiMn2O4 power batteries group management system are testified by experiments, and finally obtain some crucial experimental parameters and outcomes.