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Advantages of POOVER 9V USB Battery 【BMS smart protection 】Original Smart battery management system protect from Over Current,Over Voltage,Short Circuit,Over Charge & Discharge【Auto Reset 】by re-charge, Automatically close circuit when short circuit and high temperature【Convenient charging design 】Portable micro USB charging cable and 9v lithium ion charger【1.5 Hrs Fast charging】fit for USB port device to charge【Auto turn light LED indicator】Red in charging ; full charged in Green【High Capacity】680mAh of POOVER USB 9V Li-ion Battery. It’s 2-3 times of normal alkaline 9V battery, 3-4 times of normal Ni-Mh 9v battery【slow self-discharge】