4S 20A Li-Ion BMS Protection Board – 14.8V PCM for 18650 Battery Packs

Overcharge, Overdischarge & Short-Circuit Protection | Cell Balancing for 4S Configurations

This BMS (Battery Management System) board is designed for 4S Li-Ion battery packs (14.8V nominal) made of 18650 cells. It ensures safe operation by protecting the battery from overcharge, over-discharge, overcurrent, and short circuit conditions.

The module also provides cell balancing, ensuring equal voltage distribution across all cells, improving battery performance and lifespan.

Ideal for battery packs used in power tools, LED systems, electric bikes, UPS systems, and DIY electronics projects.

 Key Features:

• ✔️ Supports 4S Li-Ion battery packs

• ✔️ Overcharge protection

• ✔️ Over-discharge protection

• ✔️ Short circuit protection

• ✔️ Overcurrent protection

• ✔️ Cell balancing function

• ✔️ Compatible with 18650 cells

 Technical Specifications:

• Battery type: Li-Ion (18650)

• Configuration: 4S

• Nominal voltage: 14.8V

• Charging voltage: 16.8V

• Continuous current: up to 20A

• Peak current: ~30–40A

• Balancing current: ~30–60mA

• Overcharge protection: ~4.25V ±0.05V/cell

• Discharge protection: ~2.5–2.7V/cell

• Operating temperature: -20°C to +60°C

 Advantages:

• Extends battery life

• Ensures safe operation

• Protects against damage

• Compact and easy to install

• Suitable for various applications