The main performance advantages of lead-acid battery are reflected in the following aspects: the battery with the longest industrial production time and the most mature technology, stable and reliable performance and wide application fields; Using dilute sulfuric acid as electrolyte, no flammability, battery using atmospheric pressure or low pressure design, good safety; High operating voltage, good power characteristics, wide operating temperature range, suitable for HEV and other high-rate discharge applications; It can be used for floating charging, with excellent performance of light charging and light discharging, and no memory effect. It is suitable for UPS, renewable energy storage and other fields. Large and small battery technology is mature, can be made into ampere-hour class and thousands of ampere-hour battery specifications.