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

The 3S 40A Enhanced BMS is a lithium battery protection board designed for 3S (3-cell series) battery packs using 3.7V nominal lithium-ion cells, including 18650, 26650, and lithium polymer types. Built for high-drain applications, this version provides fast response protection and enhanced reliability under demanding load conditions.

Unlike the balanced version, this enhanced board prioritizes robust current handling and system protection without cell balancing functionality. It is suitable for applications with moderate to high power requirements where external balancing or matched cells are used.

Key Features:

• Supports 3S lithium battery packs (11.1V nominal, 12.6V max)
• Continuous Discharge Current: Up to 40A
• Surge/Start Current: Supports loads up to 80A (short duration)
• Power Support: Up to 130W total system output
• Protection Functions:
  • Overcharge protection
  • Over-discharge protection
  • Overcurrent protection
  • Short-circuit protection
• Automatic Recovery: Recovers from faults after conditions return to normal
• Compact Size: Approx. 41 x 55 x 3.4 mm
• Note: This version does not include active cell balancing

Applications:

Ideal for e-bikes, power tools, LED lighting systems, DIY power banks, and other medium-to-high load battery-powered systems that demand high current support and basic protection.

This product can be found here:

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