Automatic fire alarm systems require uninterrupted regulated power, and maintenance-free lead-acid batteries are optimal standby power for weak-current fire systems. With stable discharge voltage, vibration resistance and low self-discharge rate, they switch power instantly during blackouts to ensure full-time operation of smoke detectors, alarm hosts and linkage modules. Their sealed structure prevents electrolyte leakage in humid and smoky fire scenarios, fitting closed installation in fire electric wells. With mature technology and compatibility with mainstream fire alarm devices, they support long-term fire monitoring, sound-light warning and partition linkage to build front-line fire prevention barriers.