BMS is the most noteworthy and important part of DIY LiFePO4 batteries. In general, BMS must be installed when assembling lithium-ion batteries. The full name of BMS is “Battery Management System”, which is a “Battery Housekeeper” with many functions. It can intelligently monitor, manage and maintain each battery unit to prevent the battery from overcharging, over-discharging, over-current, etc., and can provide temperature monitoring and management functions to prevent the battery from overheating, thereby extending the battery life. At the same time, some high-end BMS will also have functions such as low-temperature cutoff and Bluetooth. Diverse functions can effectively prevent problems with LiFePO4 batteries, which is why it is necessary to install a BMS. In addition, the BMS suitable for LiFePO4 batteries of different voltages is different, which needs to be selected according to the actual situation.