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