Ultra-large capacity lead-acid batteries above 200Ah are fixed energy storage dedicated batteries with huge energy storage capacity and strong continuous power supply capability, focusing on large-scale long-term power supply scenarios. They are mainly applied in photovoltaic energy storage systems, RV energy storage, marine standby power, power DC screens, large computer room UPS, and emergency power supply systems of hospitals and financial institutions. Adopting thickened corrosion-resistant grids, they support deep discharge resistance and long cycle life with long-term stable voltage output, meeting all-weather uninterrupted power supply needs. Widely used in unattended remote power stations and large industrial energy storage projects, they balance grid load and respond to sudden power outages.