Cost control is a core consideration for large-scale energy storage deployment in data centers, where lead-acid batteries show prominent cost advantages. They have lower initial procurement costs than lithium batteries and require no expensive supporting electronic control equipment, cutting down system construction investment. With a mature operation and maintenance system, single faulty batteries can be replaced independently instead of the whole group, reducing later maintenance costs. Supported by a complete recycling system and high residual value, they deliver significant full-life-cycle cost advantages, perfectly matching the 5-15 minute short-term backup power demand of data centers.