3S 40A 18650 Battery Charger Protection Board (BMS)

This 3S 40A BMS is designed to manage and protect 3-cell lithium-ion battery packs. It ensures safe charging, discharging, and balancing of each cell, preventing overcharge, over-discharge, overcurrent, and short-circuit issues. Ideal for battery packs used in e-bikes, power tools, solar storage, and DIY energy systems.

• 3-Cell (3S) Protection
  Supports 3-cell Li-ion  battery packs.

• High Current Handling
  Supports continuous discharge current up to 40A, suitable for high-power applications.

• Overcharge Protection
  Prevents battery voltage from exceeding safe limits.

• Over-discharge Protection
  Cuts off power when the cell voltage drops too low, extending battery life.

• Short Circuit & Overcurrent Protection
  Provides automatic recovery after fault removal.

• Cell Balancing Function
  Helps maintain equal voltage across all cells during charging.

• Battery Type: Li-ion 

• Number of Cells: 3S (3 cells in series)

• Max Continuous Discharge Current: 40A

• Charging Voltage: 12.6V

• Overcharge Detection Voltage: ~4.25V ± 0.05V

• Over-discharge Detection Voltage: ~2.7V ± 0.1V

• Balance Function: Yes

• Short Circuit Protection: Yes, with auto recovery