Lithium Battery Charger Protection Module (BMS) 3S 25A 12.6V

Specifications :

• Voltage: 11.1V 12V 12.6V
• Overcharge 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.

Introduction of BMS.

A Battery Management System, or BMS for short, is used to protect 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, as well as 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 that you are decent with a soldering iron to add the charge/discharge/balance  wires. 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 kit. 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.

Note: this BMS is designed for lithium-ion cells, and will not work for LiFePO4 cells.