The online battery monitoring system is a high - tech product that takes the internal resistance of the battery, the terminal voltage of the battery, the total voltage of the battery pack, the total current of the battery pack, and the temperature of the environment where the battery pack is located as the main monitoring parameters. It conducts real - time monitoring and analysis of the performance and status of the battery to judge the service life of the battery. This system can track the performance balance of the battery, automatically record and control the charging and discharging process of the battery.