Specification: Model Number ：YZPOWER-450 Dimensions: 205*121*50mm Battery type: Li-ion battery Working power: 90-230Vac, 50 ~ 60Hz Suitable for Battery Voltage: 72V Output voltage: 84V (For 20S Li-ion Battery) Output current: 5A battery Protection: SCP,OVP,OCP,OTP Charging mode: constant current - Constant Voltage - trickle (floating charge) three-stage intelligent charging Charging efficiency: ≥87% (full load) Working temperature: -50°F~122°F Storage Temperature: -104°F~+176°F Operating Humidity: 20~90%RH AC power cord, DC connector can be customized. Operating Instruction 1. Before charging, please connect the DC terminal to battery first, and then connect the AC terminal. 2. After charging complete, unplug the AC terminal firstly, and then unplug the DC terminal. 3. No charging or after charging complete, be sure to unplug the DC terminal and AC terminal. LED Indicator: LED 1 red: Power on. LED 2 red: Battery being charged. LED 2 Flash: Battery will be charged completely soon. LED 2 green: Battery has been charged completely. Advantages 1.The case is made of aluminum alloy , The product has two built -in electric fans, forming a double convection system. 2.Four sets of circuits are connected in parallel, one of which is damaged, and the product can continue to work, increasing the service life of the product. 3.It contains filters inside, so that the charger makes anti-jamming performance much strengthen.