Lithium Battery Charger Protection Module (BMS) 2S (8.4V – 20A )

2S Lithium Battery Charger Protection Module (BMS) – 8.4V 20A

This high-current 2S BMS module is designed for 2-cell lithium-ion or lithium-polymer battery packs (7.4V nominal, 8.4V fully charged). With a 20A discharge current capacity, it’s ideal for demanding applications such as RC vehicles, e-bikes, robotics, power tools, and high-drain DIY power banks.

🔧 Key Features

• Battery Configuration: 2S (2 cells in series)

• Nominal Voltage: 7.4V

• Max Charging Voltage: 8.4V (4.2V per cell)

• Discharge Current: Up to 20A

• Charging Current: Typically up to 10A

• Built-in Protections:

  • Overcharge protection

  • Over-discharge protection

  • Overcurrent protection

  • Short-circuit protection

  • Optional cell balancing (depends on version)

• Heavy-duty MOSFETs for handling high current

• Compact PCB design suitable for DIY and commercial battery packs

📐 Technical Specifications

• Overcharge Protection: ~4.25V ± 0.05V per cell

• Over-discharge Protection: ~2.8V ± 0.1V per cell

• Overcurrent Protection: 20A (instantaneous limit up to ~50A depending on model)

• Short-circuit Protection: Yes (auto recovery or manual reset depending on model)

• Working Temperature: –40°C to +85°C

• Board Size: Approx. 50mm × 25mm × 3mm

• Wiring Type: Solder pad (B+, B–, B1, P+, P–)

🛠️ Connection Guide