4S-20A LiFePO₄ (LFP) BMS — JLGW Model

Overview
The JLGW 4S-20A BMS is designed for 4-cell LiFePO₄ battery packs with a nominal voltage of 12.8V. It supports up to 20A of continuous discharge current and provides essential protections and passive balancing, making it ideal for low to medium-power battery applications.

Specifications

• Cell Configuration: 4S (4 cells in series)

• Battery Chemistry: LiFePO₄ (LFP)

• Nominal Voltage: 12.8V (3.2V × 4)

• Maximum Continuous Current: 20A

• Peak Current: 25A–30A (short bursts)

• Balancing Type: Passive balancing

• Balance Current: Approx. 30mA–60mA

• Protection Features:

  • Over-voltage protection

  • Under-voltage protection

  • Over-current protection

  • Short-circuit protection

  • Over-temperature protection

  • Under-temperature protection

• Communication: Typically not included on 20A models (varies by version)

• Operating Temperature Range: -20°C to +60°C

Features

• Monitors and protects each cell in a 4S LiFePO₄ pack

• Automatic passive balancing during charging

• Comprehensive protection for voltage, current, and temperature

• Compact design ideal for space-limited installations

• Simple and reliable operation for everyday use

Applications

• 12.8V LiFePO₄ battery packs

• LED lighting systems

• Portable power supplies

• Backup power systems

• Small electric vehicles and tools

• DIY battery projects

Important Notes

• Designed only for LiFePO₄ (3.2V/cell) chemistry

• Proper wiring of balance leads is essential for safe operation

• Max continuous current should not exceed 20A

• Ensure the BMS model matches your pack’s voltage and usage profile

• If communication or Bluetooth is needed, verify that your model supports it