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This 4V 1A lead-acid battery is a small yet powerful rechargeable battery used in emergency lighting, security alarms, and backup power systems. It delivers a stable 4V output with a 1A current capacity, ensuring consistent energy supply for critical applications. The battery is sealed and maintenance-free, reducing the risk of leakage. Its deep cycle capability allows multiple charge-discharge cycles without significant capacity loss. It is an ideal choice for small electronic devices requiring reliable backup power.