With the popularization of smart homes, 12V lead-acid batteries have become high-quality backup power sources for small household devices. They work in an intelligent floating charge state and recharge automatically when the municipal power is stable without manual operation. During temporary power outages caused by grid maintenance and bad weather, they can stably supply power to smart gateways, surveillance cameras, smart door locks and small desktop lamps with small inverter modules. Featuring high temperature resistance, leakage prevention and stable service life, the batteries are low-cost and easy to maintain. They effectively avoid the paralysis of smart home systems caused by power cuts and ensure all-weather stable operation of household smart devices.