Overview
The 4S 40A Balanced BMS is a high-current battery management system designed for 4-series (4S) Lithium-ion or Lithium-polymer battery packs. It acts as the “brain” of your battery, monitoring each cell individually. This enhanced version includes a balancing circuit, which ensures that all cells reach the same voltage during charging, significantly extending the overall lifespan of your 18650 or 21700 cells.
Key Features
Active Balancing: Integrated resistors balance the voltage between cells during the final stages of charging.
40A High Current: Capable of handling up to 40A continuous discharge, making it suitable for power tools and motor drivers.
Triple Protection: Safeguards against Overcharge (>4.25V), Over-discharge (<2.5V), and Short-circuiting.
Heat Dissipation: Features a large surface area and high-quality MOSFETs to manage heat during high-load operations.
Versatile Application: Perfect for creating 14.8V (nominal) or 16.8V (max) battery packs.
Technical Specifications
| Feature | Specification |
| Compatible Battery | 3.7V Li-ion (e.g., 18650, 21700, 26650) |
| Configuration | 4 Series (4S) |
| Continuous Discharge | 40A (Max) |
| Continuous Charge | 20A (Max) |
| Charging Voltage | 16.8V to 17.2V |
| Overcharge Protection | 4.25V \pm 0.05V |
| Over-discharge Protection | 2.5V \pm 0.05V |
| Balancing Current | 100mA |
| Board Size | 45mm x 60mm |
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