The 4S 12V 120A BMS (Battery Management System) is a protection board designed for 4-cell (4S) lithium iron phosphate (LiFePO4) batteries. It ensures your battery pack works safely by preventing damage from overcharging, over-discharging, or excessive current.

⚡ Key Features

• For 4S (12V) LiFePO4 Batteries:
  Designed for 4 × 3.2V cells connected in series
• High Current Support:
  • Continuous current: up to 120A
  • Peak current: up to 300A
• Multiple Protection Functions:
  • Overcharge protection
  • Over-discharge protection
  • Overcurrent protection
  • Short circuit protection
• Cell Balancing Function:
  Keeps all battery cells at equal voltage to extend battery life
• Efficient Heat Dissipation:
  Built with aluminum plate/heatsink for safer operation

🔌 Technical Specifications

• Battery Type: LiFePO4 (Lithium Iron Phosphate)
• Nominal Voltage: 12V (4S)
• Charging Voltage: 14.8V – 16V
• Charging Current: Up to 50A
• Overcharge Cutoff: ~3.75V per cell
• Over-discharge Cutoff: ~2.1V per cell
• Max Load Power: Up to ~1500W

🔧 How It Works

👉 Connect it to your 4 battery cells (in series)
👉 The BMS monitors voltage, current, and balance
👉 It automatically cuts off power if unsafe conditions occur

🧰 Applications

• Electric bikes & scooters
• Solar battery storage systems
• DIY battery packs
• Power tools & backup systems

⚠️ Important Notes

• Only for LiFePO4 batteries (NOT Li-ion or LiPo)
• Correct wiring is very important (follow diagram carefully)
• Use proper insulation and cooling for high-current use

Package Includes: 

• 1 x Protection Board
• 1 x connector