The 12V20Ah lead-acid batteries is widely used in building fire emergency supporting equipment and serves as an important energy storage unit for fire weak current systems. It meets fire equipment power supply standards with high safety and stability, high temperature resistance and low failure rate, suitable for emergency facilities in high-rise buildings, shopping malls and office buildings. It is mainly used for fire emergency lights, evacuation indicator lights, fire sound and light alarms and emergency broadcast backup power. It can automatically supply power in emergencies to support personnel evacuation and rescue, and its maintenance-free design perfectly meets the long-term standby requirements of fire equipment.