Quick Detail: Brand Name:QUAWIN Model Number:QW740-400-L Use:20S 72V 74V Li-ion or Li-polymer battery pack Type:Electric Place of Origin:Guangdong China (Mainland) Battery charger:automatic battery charger 84V Color:Black Shell Material:Metal case Input voltage:AC 180~264V 50/60Hz Output voltage:84V Output current:40a(Max) Output power:3360W Charge mode:CC-CV(Constant Current-Constant Voltage) Output Connector:Crocodile clip,aviation connector,Ring terminal,SB120A Plug,customization Packaging & Delivery : 2pcs/Carton Carton size: 615*520*235mm Delivery Detail:sample within 7 work days,15~25 days for bulk order Specifications: 20S 72V 74V Li-ion or Lithium Polymer battery PACK Features: • Charging mode:CC-CV(Constant Current-Constant Voltage) • High efficiency and low power consumption • Stabilized output and low noice • Efficiency(at 100% load): >=90% • Operating temperature:-20ºC ~ 45ºC • Storage temperature:-40ºC ~ 85ºC • Operating humidity:5%~90%RH Specification: • Input: AC 180~264V 50/60Hz • Output: DC 84V • Charging current: 40a(Max) • Dimensions (mm): 315*180*90mm • Weight: 8000g(only body) Safety protections: • Over Voltage protection • Short Circuit protection • Polarity error protection • Over power protection LED Indicator: Waiting Mode:LED(GREEN) ON Charging Mode:LED(BLUE) FLASH Full Charged Mode:LED(GREEN) ON Charge Error Mode:LED(RED) FLASH Call us to know more details datasheet. (A Typical Model) Model Input Voltage(V) Battery Voltage(V) Charging Voltage(V) Charging Current(A) QW256-1000-F (LiFePO4) 180~264V 25.6(8S) 29.2 100 QW384-800-F 38.4(12S) 43.8 80 QW512-600-F 51.2(16S) 58.4 60 QW640-500-F 64(20S) 73 50 QW768-400-F 76.8(24S) 87.6 40 QW259-1000-L (Lithium) 25.9(7S) 29.4 100 QW370-800-L 37(10S) 42 80 QW481-600-L 48.1(13S) 54.6 60 QW629-500-L 62.9(17S) 71.4 50 QW740-400-L 74(20S) 84 40 QW240-1000-S (Lead Acid) 24(2S) 29.4 100 QW360-800-S 36(3S) 44.1 80 QW480-600-S 48(4S) 58.8 60 QW600-500-S 60(5S) 73.5 50 QW720-400-S 72(6S) 88.2 40