Name: 4S 40A 18650 Lithium Battery Protection Board
Brand: Generic
SKU: 22398
Availability: InStock

4S 14.8V 16.8V 40A 18650 Lithium Battery Protection Board is a high-current battery management system designed for 4-cell lithium-ion battery packs. This PCB integrates overcharge, over-discharge, over-current, and short-circuit protection, making it ideal for high-power applications like electric tools, drones, and power banks.

Key Features of 40A 18650 Lithium Battery Protection Board:

- High Current Capacity: 40A continuous discharge current
- Comprehensive Protection: Overcharge, over-discharge, over-current, and short-circuit
- Voltage Balancing: Individual cell balancing during charging
- LED Indicators: Displays charging status and faults
- Low Power Consumption: <100μA in standby mode

Technical Specifications of 40A 18650 Lithium Battery Protection Board:

- Battery Configuration: 4S (14.8V nominal, 16.8V max)
- Charge Voltage: 16.8V ±0.05V
- Discharge Cutoff: 10.0V ±0.5V (2.5V/cell)
- Max Continuous Current: 40A
- Peak Current: 80A (pulse, <3 seconds)
- Balancing Current: 35mA ±5mA per cell
- Operating Temp: -20°C to +60°C
- PCB Dimensions: 70mm × 50mm × 3mm

Protection Parameters of 40A 18650 Lithium Battery Protection Board:

- Overcharge Protection: 4.25V ±0.05V per cell
- Over-discharge Protection: 2.5V ±0.1V per cell
- Over-current Protection: 60A ±5A (recoverable)
- Short-circuit Protection: >100A (instantaneous)
- Cell Resistance: <80mΩ per channel

Connection Guide of 40A 18650 Lithium Battery Protection Board:

- Battery Connections:
  - B-: Connect to battery pack negative
  - B1-B3: Connect to cell junctions (3 wires between 4 cells)
  - B+: Connect to battery pack positive
- Load/Charge Connections:
  - P-: Connect to system ground
  - P+: Connect to load/charger positive
- Important Notes:
  - Connect cells in series before attaching to BMS
  - Never short P+ and P- terminals
  - Use thick gauge wire for high current applications

Applications of 40A 18650 Lithium Battery Protection Board:

- Power Tools: Cordless drills, saws, and sanders
- Electric Vehicles: E-bikes, scooters, and hoverboards
- RC Devices: Drones and high-power remote control vehicles
- Solar Storage: DIY solar power battery banks
- Backup Power: UPS and emergency power systems