Small communication base stations, tunnel signal stations and outdoor communication terminals have urgent demands for standby energy storage equipment. The 12V33Ah lead-acid batteries has become a mainstream communication energy storage accessory due to its high reliability. It can be used singly or in series to meet the energy storage needs of small communication equipment in outdoor, tunnel and remote road sections. It stores energy and stabilizes voltage daily to ensure stable operation of communication equipment, and quickly supplements power in case of power outage caused by extreme weather or line faults to avoid signal interruption. Featuring wide temperature operation, low self-discharge and anti-interference, it adapts to complex outdoor working conditions and provides long-term stable energy storage for communication equipment.