6A 40A BMS 3326625

Description

4S 40A Li-ion Battery Charger Protection Board (Balanced Version)Product DescriptionThe 4S 40A BMS Board is a high-current battery protection module engineered for managing a 4-cell (4S) Lithium-Ion or Lithium-Polymer battery pack. Operating at a nominal voltage of 14.8V (up to 16.8V when fully charged), this board acts as the central safety manager for DIY battery setups. It features an integrated equalization/balance circuit to ensure each individual cell charges evenly, maximizing the life and capacity of your power pack while offering comprehensive defenses against electrical faults.Integrated Cell Balancing: Automatically redistributes charging currents to ensure all 4 cells reach peak voltage simultaneously, extending battery lifespan.High Current Handling: Supports a continuous discharge current of up to 40A, making it ideal for high-drain applications like power tools.Multi-Layer Protection: Built-in safeguards against over-charge, over-discharge, over-current, and short circuits.Optimized Thermal Dissipation: Designed with an exposed copper layout and a robust MOSFET array to efficiently dissipate heat under high load.Compatibility GuideThis module is designed exclusively for 3.7V nominal (4.2V fully charged) Lithium-Ion or Li-Po cells configured in a 4-Series (4S) structural layout.CategoryCompatible Products & ConfigurationsBattery Cells* 18650 & 21700 Li-ion cells (e.g., Samsung 25R, LG HG2, Sony VTC5/VTC6, Panasonic).* 3.7V Lithium-Polymer (Li-Po) pouch cells stacked in a 4S sequence.* Note: Not compatible with 3.2V LiFePO4 cells.Power Tools & MotorsCordless electric drills, electric screwdrivers, impact drivers, robotic vacuum cleaners, and high-torque 12V–16V DC motors.DIY & Power SystemsPortable power banks, 12V/14V solar backup batteries, DIY uninterruptible power supplies (UPS), and RC model ground stations.Charging InputsStandard 16.8V to 17V DC constant-current/constant-voltage (CC/CV) battery chargers.⚠️ Wiring & Safety Warning:Follow the sequence: Always solder the battery connections precisely in order from lowest voltage to highest: 0V (B-), 4.2V (B1), 8.4V (B2), 12.6V (B3), and 16.8V (B+). Incorrect wiring will immediately burn out the protection ICs.Do Not Mix Cells: Always use identical battery cells with the same capacity, internal resistance, and state of charge. Mixing old and new cells will cause unstable balancing and trigger early safety cut-offs.