Most outdoor photovoltaic and wind power projects are located in remote areas with difficult equipment maintenance and high maintenance costs for traditional energy storage devices. Sealed maintenance-free valve-regulated AGM and gel lead-acid batteries have stable electrolyte without leakage, requiring no regular water addition and electrolyte detection, greatly reducing operation pressure of outdoor energy storage systems. Supporting wide temperature operation from -20℃ to 50℃, they are vibration and aging resistant, adapting to harsh outdoor environments. With fast response speed, they switch power supply seamlessly during grid fluctuations and power generation interruptions, ensuring stable operation of wind-solar energy storage systems.