Sealed lead-acid batteries for solar backup storage are mainly divided into AGM and gel types, suitable for different photovoltaic scenarios. AGM batteries feature low internal resistance, stable instantaneous current output and high cost performance, ideal for household PV systems and small UPS backup power with low self-discharge rate and simple maintenance. Gel batteries have better over-discharge resistance, longer cycle life and stronger temperature adaptability, making them perfect for outdoor large-scale PV stations and long-term cyclic energy storage. Both types are maintenance-free and leakage-free, serving as mainstream choices for solar backup power based on actual power load, environment and cycle frequency.