The 12V33Ah sealed lead-acid batteries is a core emergency energy storage device for building fire protection systems. With the advantages of maintenance-free, leak-proof and high stability, it is widely adapted to fire supporting systems of office buildings, communities, shopping malls and other buildings. It is in a floating charge energy storage state to reserve electric energy when the municipal power is normal. It can switch power supply seamlessly in case of sudden power outage or circuit failure, providing continuous power for fire alarm hosts, emergency lighting, evacuation indicators and fire broadcasting. With sufficient capacity, it supports long-term stable operation of fire-fighting equipment, meets building fire acceptance standards, and ensures orderly evacuation and rescue in emergencies.