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This 3S 12.6V 40A Lithium Battery Protection Board (BMS) is designed to provide reliable charging, discharging, and balancing protection for 3-cell (3S) lithium-ion battery packs. It supports high-current applications and ensures safe operation by protecting against overcharge, over-discharge, overcurrent, and short circuits. The integrated balancing function enhances battery lifespan and performance consistency.

Key Features

  • 3S (12.6V) lithium battery protection module
  • Maximum continuous discharge current: 40A (adequate heat dissipation required)
  • Continuous charging current up to 20A
  • Integrated cell balancing function
  • Supports 18650, 26650, and lithium polymer batteries
  • Suitable for high-power loads up to 170W
  • Overcharge protection (4.2V per cell)
  • Over-discharge protection
  • Overcurrent and short-circuit protection
  • Compact PCB design for DIY battery pack integration

Technical Specifications

  • Product Type: 3S Lithium Battery Protection Board (Balanced Version)
  • Nominal Battery Voltage: 11.1V (3 × 3.7V)
  • Full Charge Voltage: 12.6V (3 × 4.2V)
  • Charging Voltage: DC 12.6V – 13.6V
  • Maximum Continuous Discharge Current: 40A
  • Maximum Continuous Charging Current: 20A
  • Balancing Function: Yes (active during charge when cell differences are minimal)
  • Board Dimensions: 41 × 61 × 4 mm
  • Compatible Batteries: 18650, 26650, Lithium Polymer (3.7V nominal, 4.2V full charge)
  • Recommended Wiring: ≥3mm² copper wire
  • Maximum Recommended Load Power: ≤170W

Important Installation Notes

  • Strictly connect according to voltage sequence: 0V – 4.2V – 8.4V – 12.6V
  • Do not short circuit the board intentionally
  • Do not touch board components while soldering
  • Nickel strips are not suitable for high-current output wiring; use proper copper conductors
  • For high-current tools (e.g., drills), use high-discharge cells (10C–20C rated)
  • Balancing resistor (“430”) may heat slightly when cell voltage exceeds 4.2V during first charge; excessive heating indicates incorrect wiring

This product is suitable for DIY battery packs, electric tools, backup power systems, and other high-current 12V lithium battery applications requiring reliable protection and balancing.