A Battery Management System, or BMS for short, protects your battery during charging and discharging. During charging, the BMS will monitor the voltage of all of your cells and balance the cell groups to ensure they are charged equally. During discharging, the BMS will monitor the voltage of all of the cells, the entire pack voltage, and the discharge current. If the BMS determines that any of its preset limits have been passed, such as the battery draining too low or an unsafe amount of current being pulled from the battery, the BMS will cut power to the battery to protect it from damage. This 3s BMS is fairly easy to install but will require decent with a soldering iron to add the charge/discharge/balance wires (and you can get the wires here or the connectors here). You should use fairly heavy gauge wires for the charge/discharge wires, while very small wires can be used for the balance wires as they carry much less current. The wiring diagram for this BMS is shown below, and you can read an article showing you how to install a BMS on your VRUZEND kit here. Please make sure you read the instructions in that article so you can install your BMS properly. Note: Be sure to use sufficiently thick wires for B , B-, P and P- to carry the current that your device requires.Details:Brand newSize: about 56mm*45mm*1.2mmOvercharge voltage range: 4.25-4.35v 0.05v.Over-discharge voltage range: 2.3-2.7v 0.05v.Operating current: 0 – 25A.Operating temperature: -40 – 50℃.Instantaneous current: 35 – 40A.Storage condition: -40 – 80℃.Quiescent current: less than 30uA.Balance current: about 40 – 50mA.Effective life: more than 30000 hours.Internal resistance: less than 100m ohm.Short-circuit protection: protection, delayed self-recovery.Short circuit protection: Yes, delayed self-recoveryWelding point Description:B : Connect to the battery positive. B-: Connect to the battery negative. BM: Connect to the battery 1 and battery 2 joining points. P : Connect to the charge/discharge side of the positive terminal. P-: Connect to the charge/discharge side of the negative terminal.Package:1x25A W/Balance 18650 Li-ion Lithium Battery PCB Protection Board.
