2V lead-acid batteries are the core basic equipment of large-scale photovoltaic energy storage power stations. With the flexible characteristics of single-cell voltage stabilization and series-parallel connection, they adapt to various large and medium-sized photovoltaic energy storage scenarios. Compared with conventional 12V batteries, 2V single-cell batteries have a capacity ranging from 100Ah to 3000Ah, and can be freely combined into high-voltage energy storage arrays such as 48V and 80V to meet the energy storage needs of megawatt-level photovoltaic power stations. Adopting valve-regulated sealing and tubular colloid technology, they have a floating charge life of up to 20 years and strong weather resistance. With high cost performance, simple operation and maintenance, and stable safety, they are the mainstream energy storage choice for industrial and commercial photovoltaic and grid energy storage projects.