Model Number: EB4808-004 Key Specifications/Special Features: We specializes in lithium battery packs field from 2005,and most of our products are CE, RoHS, FCC certified 1. Technical FeaturesRated Voltage48V Rated Capacity 8.8Ah Internal resistance ≤200mΩ Battery type 18650 Lithium-ion cell Configuration 13S4P Cycle lifespan more than 500 cycles Warranty 12 months Charge Way of Charge CC/CV(Constant Current; Constant Voltage) Standard Charge Current 5A Max Charge cut - off voltage 54.6V Cell Overcharge Protection Voltage 54.6V Charging time: 3-5 hours by 54.6V/2A charger Discharge Standard Discharge Current 15A can be customized Discharge Cut-off Voltage 39V Cell Over discharge Protection Voltage 39V Ratio Discharge 1C >96%C1 2C >93%C1 3C >90%C1 2. Basic Characteristics Weight 3kg Dimension(T*W*H) 382*109*63mm Shell material fireproofing ABS+PC Working temperature Charge Temperature 0~45°C Storage Discharge Temperature -20~65°C Storage humidity range 45-85% relative humidity Storage temperature range 3 months: -20-60℃ 6 months: -20-45℃ 1 year: -20-25℃ 3. Safety and protection over charge protection No fire, No explosion over discharge protection over current Protection short circuit protection over heating protection Crush Safety Test Needling Safety Test Extrusion Safety Test