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The 4V 0.5A lead-acid battery is a sealed rechargeable battery designed for small-scale applications. It provides a stable and reliable power source for emergency lights, backup systems, and electronic circuits. With a low discharge rate and deep cycle capability, it offers consistent performance over time. The battery features a maintenance-free design and built-in protection against overcharging. It is widely used in security devices, solar lighting, and low-power backup systems.