In retail scenarios such as supermarkets and convenience stores, 12V lead-acid batteries serve as the core backup power for cash register equipment, passenger flow statistical instruments and security alarm terminals. Retail business requires high equipment continuity, and sudden power outages may cause cash register data loss, equipment shutdown and security vacancies. The batteries store energy continuously under normal power supply and switch automatically to support the short-term operation of cash register hosts and industrial control equipment for data saving and orderly shutdown. With small size, flexible installation and high cost performance, they effectively avoid operating losses and equipment failure risks caused by power cuts.