The 12V 65Ah lead-acid batteries is widely used in household distributed photovoltaic and small outdoor photovoltaic energy storage systems as a core supporting device. During the day, photovoltaic panels convert solar energy into electric power to charge the battery and store surplus energy. At night or on rainy and cloudy days with insufficient sunlight and interrupted photovoltaic power generation, the battery releases power to supply lighting, small household appliances and outdoor equipment, solving the intermittency and instability of photovoltaic power generation. It has strong charging capacity and stable charge-discharge cycles, with low cost and easy maintenance, ideal for civil small-scale photovoltaic energy storage systems.