12V medium sealed lead-acid battery is a medium-sized valve-regulated sealed battery. Its capacity ranges from 40Ah to 100Ah, filling the performance gap between small and large sealed batteries. With maintenance-free and leak-proof design, it features high temperature resistance, strong shock resistance, stable voltage output, low self-discharge rate and long cycle life. It supports long-term float charging. Compared with small-capacity batteries, it has larger energy storage and higher load capacity. More compact and easier to install than large batteries, it is widely used in high-power UPS, fire emergency systems, photovoltaic energy storage, communication equipment, computer room backup power and industrial standby power supplies, serving as a reliable core power solution for commercial and industrial energy storage.