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The 4V 1.5A lead-acid battery is a robust and reliable power source for emergency backup applications. It offers a stable 4V output and a 1.5A current capacity, making it suitable for security devices, alarms, and solar-powered systems. The battery is maintenance-free and features a spill-proof design, ensuring safety and durability. Its deep cycle capability allows multiple recharges without performance degradation. It is commonly used in industrial and home automation backup power solutions.