The intermittent power generation of solar and wind energy is the core pain point of wind-solar energy storage systems, and lead-acid batteries accurately adapt to such operating scenarios. Special deep-cycle lead-acid batteries suit frequent shallow charge and discharge and day-night cycles. They store photovoltaic power during the day and surplus wind power continuously to supply electricity in powerless periods. With stronger technical compatibility than new-type batteries, they match various wind-solar inverters and controllers with simple installation and commissioning. Their flexible modular design allows capacity combination on demand, suitable for household photovoltaic, rural wind power and outdoor energy storage base stations.