Rail transit communication systems for subways and high-speed trains undertake train scheduling, signal transmission, station broadcasting and emergency intercom functions, directly related to traffic safety. As special backup power for rail transit communication,  lead-acid batteries sustain power supply during grid abnormalities and short blackouts to ensure stable operation of communication signal systems, scheduling terminals and vehicle-mounted communication equipment. They feature vibration resistance, anti-interference and good temperature adaptability, suitable for bumpy train operation and enclosed underground stations. With high safety, maintenance-free performance and long service life, they avoid traffic risks caused by communication interruption and serve as an important energy storage guarantee for rail transit communication safety.