In the large-scale construction of data centers, cost control of backup energy storage equipment is a key operation and maintenance priority. The core advantage of lead-acid batteries is outstanding cost performance. With accessible raw materials and mature production processes, their unit energy storage cost is far lower than lithium batteries and other new energy storage batteries. For large-scale computer rooms and multi-unit UPS backup scenarios, lead-acid batteries can greatly reduce the initial equipment investment and subsequent iteration costs of data centers. Meanwhile, they adapt to the floating charging operation mode with low standby loss and no frequent replacement, realizing low operation and maintenance costs. Although their energy density is lower than new batteries, their performance fully meets the requirements of short-term emergency backup scenarios, making them an optimal solution balancing safety, stability and economy.