罗马尼亚采购需求：电池管理系统，BMS电池，BMS模块，锂BMS，BMS锂电池，适用于Lifepo4的BMS

I've encountered an issue with four of your BMS products. It seems that they allow the cells to discharge below the voltage configured in the smart application, which is causing my lifepo4 cells to become unusable. Could you clarify whether this is a firmware issue or if all four units might be defective? Your insights would be appreciated, as it's crucial for me to understand the root of this problem to avoid future complications.