The 12V33Ah lead-acid batteries is a mainstream energy storage device for off-grid mini photovoltaic systems, adapted to power storage and supply in outdoor scenarios without municipal power. It is usually matched with small solar panels for wild camps, rural self-built houses, outdoor monitoring and garden equipment. It stores electric energy through solar charging in the daytime and releases power stably at night or on cloudy days to supply power for lighting, fans, small refrigeration equipment and outdoor monitoring instruments. With excellent deep cycle performance, repeated charge-discharge capacity and strong temperature adaptability, it copes with complex outdoor environments and solves daily power problems in off-grid areas, serving as a low-cost and highly adaptable outdoor new energy storage accessory.