The 12V33Ah lead-acid batteries is a core supporting power source for mini UPS systems, compatible with 1-3kVA low and medium-power uninterruptible power supplies, widely used in power supply for office, computer room and household network equipment. Featuring stable voltage and sufficient battery life, it floats in standby mode when municipal power is normal and switches power supply seamlessly during blackouts. It provides emergency power for routers, mini servers and monitoring hosts, effectively preventing equipment shutdown, data loss and hardware damage caused by sudden power outages. With maintenance-free and low self-discharge features, it can operate stably for a long time, ideal for uninterrupted power supply of daily office and weak-current equipment.