3S 40A BMS 12.6V Lithium Battery Charger Protection Board - Balanced

The 3S 40A Balanced BMS is a high-performance battery management system designed for lithium battery packs built from 3.7V nominal cells such as 18650, 26650, and lithium polymer batteries. It supports 3-cell series (3S) configurations, delivering a fully charged pack voltage of 12.6V.

This balanced version features active cell balancing, which equalizes the charge level of each cell during charging. This helps improve pack performance, prevent cell overstrain, and extend overall battery life.

Key Features:

• Supports 3S (3-cell series) lithium battery packs
• Continuous Discharge Current: Up to 40A
• Balanced Charging: Equalizes cell voltages to maintain consistent capacity and improve cycle life
• Protection Functions:
  • Overcharge protection
  • Over-discharge protection
  • Overcurrent protection
  • Short-circuit protection
• Automatic Recovery: Resumes normal operation after fault conditions clear
• Typical Applications: E-bikes, power tools, solar energy storage, DIY battery packs

Technical Specifications:

• Nominal Cell Voltage: 3.7V
• Charging Voltage: 12.6V (for 3S packs)
• Balanced Current: ~30–60mA (varies by model)
• Size: Compact and easy to integrate

The balanced BMS is ideal for battery packs that undergo frequent use or deep cycles, helping to ensure cell health and system stability over time.

This product can be found here:

• Batteries, Chargers & Holders
• Battery Chargers & BMS
• Power