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Factory Ytx9-BS Black Lead Acid Maintenance Free Motorcycle Battery. Maintenance Free Design: Complete sealed structure with Pb-Ca alloy grid, ensuring low water loss and low self-discharge. High Rate Discharge: Low internal resistance provides good high rate discharge performance for reliable power. Quality Assurance: 100% pre-delivery inspection ensures stable quality and reliable performance. Long Service Life: High charge retention and long cycle service life with a design float life of 3-5 years.