In the field of data center backup energy storage, lead-acid batteries have been verified by the market for many years with prominent sustained application value. As mature energy storage equipment, they require no complex supporting control systems, can be quickly connected to UPS backup power supply systems, featuring convenient deployment and strong adaptability. With gradual capacity attenuation, their faults are predictable, enabling operation and maintenance personnel to troubleshoot and replace batteries in advance to avoid sudden power outage risks. Meanwhile, waste lead-acid batteries have an extremely high recycling rate and can be recycled and reused, which is environmentally friendly and in line with the low-carbon operation concept of data centers. Despite limited cycle life, their advantages in performance, safety and cost fully meet the low-frequency emergency backup needs of data centers, making them a high-cost-performance optimal solution for computer room backup energy storage.