Accessories, Batteries & Chargers, BMS (Battery Management System), Breakout Boards, Modules and Breakout Boards
4S 40A 12.6V Cell 18650 Li-ion Lithium Battery Charging BMS Board Balanced Charging Module
3S 40A 12.6V Cell 18650 Li-ion Lithium Battery Charging BMS PCB Board with Protection and Balanced Charging Module. Buy online in Pakistan.
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4S 40A Li-ion Lithium Battery Charger Cell Module PCB BMS Balance Charging Board for 18650 Li-ion Batteries
The 4S 40A Li-ion Lithium Battery Management System (BMS) is a protection circuit board designed for 4-cell (4S) Lithium-ion or Lithium Polymer (LiPo) battery packs with a nominal voltage of 14.4V–14.8V and a fully charged voltage of 16.8V. It is commonly used for high-drain applications such as electric drills, sprayers, and LED lights, offering continuous discharge up to 40A, enhanced balancing, and auto-recovery.
Description and Key Features
- Balanced Charging: The balanced version (often referred to as the upgraded version) ensures each battery cell is charged to the same voltage level to prolong battery life, featuring a 100mA balancing current.
- High Power Capacity: Specifically designed with 10 low-internal resistance MOS tubes to handle 40A continuous discharge, making it ideal for powerful cordless drills.
- 4-Way Protection: Built-in protection against overcharge, over-discharge, short circuit, and over-current.
- Auto-Recovery: The BMS automatically recovers from faults like over-discharge or short circuit once the load is removed or when voltage levels stabilize.
- Enhanced Features (Upgraded Version): Newer models often feature improved anti-interference, 30% lower heat dissipation, and increased starting power (up to 220W).#
Specifications (Balanced Version)
- Battery Configuration: 4-Series (4S), Lithium-ion/Polymer.
- Compatible Nominal Voltage: 3.6V / 3.7V per cell (14.4V – 14.8V total).
- Charging Voltage: 16.8V to 18.1V DC.
- Continuous Discharge Current (Max): 40A (Requires good heat dissipation/heatsink).
- Continuous Charge Current (Max): 20A.
- Starting Power Capacity: Suitable for drills starting under 80A, power below 135W-220W.
- Overcharge Detection Voltage: 4.25V ± 0.025V per cell.
- Over-discharge Detection Voltage: 2.50V ± 0.08V per cell.
- Balanced Current: 100mA (approx.).
- Operating Temperature: -40°C to +85°C.
- Dimensions: Approximately 46mm x 60mm x 3.4mm.
Crucial Wiring Instructions
The BMS must be connected strictly according to the wiring diagram to avoid damage to the circuit:
- 0V (B-): Connect to battery pack negative terminal.
- 4.2V (B1): Connect to the positive terminal of the 1st battery.
- 8.4V (B2): Connect to the positive terminal of the 2nd battery.
- 12.6V (B3): Connect to the positive terminal of the 3rd battery.
- 16.8V (B+): Connect to the positive terminal of the 4th battery.
- P+ / P-: Connect to the charger and load (common port).
Note: The “430” resistor heating during charging indicates the balancing circuit is actively working. If the resistor heats up when not charging, check for incorrect wiring.
Important Usage Notes
- High Drain Batteries Required: To start electric drills, you must use high-drain batteries (e.g., 15C-20C). Ordinary 18650 batteries will not work.
- Voltage Balancing: Ensure all 4 groups of batteries are at the same voltage before assembly.
- Heat Dissipation: For continuous 40A use, a heatsink or enhanced cooling is required to prevent over-temperature protection from shutting down the system.
- Motor Protection: When using with brush motors, it is recommended to add a non-polar capacitor (10uF-100uF, >25V) across the motor’s positive and negative terminals to prevent voltage spikes from breaking the MOS tubes.
- Battery Configuration: 4-Series (4S), Lithium-ion/Polymer.
- Compatible Nominal Voltage: 3.6V / 3.7V per cell (14.4V – 14.8V total).
- Charging Voltage: 16.8V to 18.1V DC.
- Continuous Discharge Current (Max): 40A (Requires good heat dissipation/heatsink).
- Continuous Charge Current (Max): 20A.
- Starting Power Capacity: Suitable for drills starting under 80A, power below 135W-220W.
- Overcharge Detection Voltage: 4.25V ± 0.025V per cell.
- Over-discharge Detection Voltage: 2.50V ± 0.08V per cell.
- Balanced Current: 100mA (approx.).
- Operating Temperature: -40°C to +85°C.
- Dimensions: Approximately 46mm x 60mm x 3.4mm.
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