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Ship from US Warehouse (Chicago), arrived about 3-7 working days after shipment. Our company is high-tech enterprise specialized and has 10 years of experience in lithium battery production & sales. Our products are mainly exported to the United States, Europe, Australia, Russia and so on. Our products have passed UL, CE and other national safety certifications. They also have passed the SGS test and are widely used in electric bicycle, motor and scooter. We maintain high standards of excellence and strive for 100% customer satisfaction, please be free to contact us when you have any problem about our products, we have professional people to help solve your problems at the first time! Welcome to buy. SPECIFICATIONS: Battery Model: 48V 20Ah Nominal Voltage(V): 48V Nominal Capacity (AH): 20Ah Cell Combination: 8-parallel 13-series Cell Size: 18650 Cell Quantity (parallel*series): 91pcs Discharge Cutoff Voltage (V): 36.4+/- 1V Charge Voltage : 54.6V Charge Cutoff Voltage (V): 54.6V Rated Discharge Current (A): 20A Instantaneous Maximum Discharge Current (A): 50A Maximum Continuous Discharge Current (A): 20A Standard Charge Current (A): 2A Charge Time under Standard Charge Current: 8 hours Fast Charge Current (A): 5A Charge Time under Fast Charge Current: 4 hours Charge Temperature Range: -20 to 55°C/-4 to 131°F Cell Size (L*W*T ): 260*145*70mm / 10.2*5.7*2.8inch Battery Weight: About 5kg / 11lb Battery Power: 750W(Max) PACKAGE LIST: 1 x 48V 20Ah Battery Pack 1 x 54.6V 2.0A Charger (Two types of chargers are shipped randomly ) 1 x BMS (Be built in Battery) 1 x T-line connector (Discharge)