You'd better take a photo. According to you, your protection board should have separate charging and discharging ports. The red and black wires are the discharge ports. This port is not intended for charging. One should be a charging cable. You can use a multimeter to determine the voltage, then find a charging connector and solder it to charge. As for the extra cable, it is probably the voltage detection cable of the protection board. There are many more, each There is one on the positive pole of the battery chain. Maybe you didn't see it~ Or maybe it leads two sets of wires from the charging port to allow you to create two charging connectors? Use a multimeter to measure voltage
What are the two wires to charge a 48v lithium battery?
Introduction What are the two wires to charge a 48v lithium battery? You better take a photo. According to you, your protection board should have separate charging and discharging ports. The red and black wires are the discharge ports which cannot charge or receive el