BMS 3S 40A Li-ion Battery Protection Board

The BMS 3S 40A Li-ion Battery Protection Board is designed to protect 3-cell (3S) lithium-ion or lithium-polymer battery packs from overcharging, over-discharging, and excessive current flow. This module ensures the safety, longevity, and efficiency of your battery pack by regulating voltage and current. Ideal for use in electric bikes, power tools, solar energy systems, and DIY battery packs, it offers automatic balancing and a compact design for easy integration into various applications.

Specifications:

• Battery Type: Lithium-ion (Li-ion) / Lithium Polymer (LiPo)
• Number of Cells: 3 (3S configuration)
• Nominal Voltage: 11.1V (3.7V per cell) / 12.6V (fully charged)
• Maximum Continuous Discharge Current: 40A
• Maximum Charge Current: 20A
• Overcharge Protection Voltage: 4.25V ± 0.05V per cell
• Over-discharge Protection Voltage: 2.5V ± 0.05V per cell
• Overcurrent Protection: 50A ± 5A
• Short-Circuit Protection: Yes, with automatic recovery
• Balance Function: Yes, passive balancing
• Operating Temperature: -20°C to 60°C
• PCB Dimensions: Varies (typically around 50mm x 20mm)
• Wiring: B-, B1, B2, B3 for battery connection; P- and P+ for output