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7.4V Various Capacity Electric Device Reachargeable Lithium LiFePO4 Recharegable Battery Pack. Customizable Battery Pack: Customized options available for cathode material, combination, and charge/discharge currents. High Cycle Life: Guaranteed cycle life of over 200 cycles with retention rate of 80% or higher. Built-in BMS Protection: Equipped with Battery Management System for safety and prolonged storage performance. ISO9001 Quality Control: Manufactured under strict ISO9001:2008 and TS16949 quality control standards. Versatile Applications: Suitable for speakers and various other electric devices requiring 7.4V power.