4S 40A 16.8V Balance Lithium Battery Protection Board BMS Module REV 2.3
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৳ 120.00৳ 150.00 (-20%)
This high-current 4S 40A Lithium Battery Protection Board (BMS REV 2.3) manages and protects four series-connected 3.7V lithium cells (such as 18650, 21700, or 26650 packs). Specially optimized for high-power electric drills and motors, it features an integrated active cell-balancing circuit with 430-ohm precision resistors to maximize cell lifespan and safeguards your projects against overcharge, over-discharge, and high-current overloads up to 40A.
High-Current 4S 40A Lithium Battery Protection Board with Balancing (REV 2.3)
Overview
The 4S 40A Balance Battery Management System (BMS) Revision 2.3 module is an industrial-grade protection board engineered to safely manage, protect, and synchronize a 4-cell series configuration of 3.7V lithium-ion or lithium-polymer batteries (such as 18650, 21700, or 26650 cells). Offering a nominal operating profile of 14.8V and a maximum full-charge cutoff threshold of 16.8V, this module is optimized to handle high continuous currents while extending the overall operational lifespan of your custom battery banks.
Active Cell-Equalization Balancing Circuit
Standard multi-cell packs often suffer from voltage discrepancies during charge cycles, leading to premature battery degradation. This REV 2.3 module resolves this using an integrated active balancing layer featuring four high-precision 430-Ohm power resistors. As individual cells approach full capacity, these resistors intelligently dissipate excess voltage from faster-charging cells, allowing slower cells to safely catch up. This process ensures all four cells stay tightly synchronized, unlocking maximum runtime and usable capacity from your pack.
Motor and Power Tool Optimization
Unlike entry-level protection modules that false-trip under high inductive startup currents, the REV 2.3 variant is built around ten ultra-low-resistance Nikos power MOSFETs arranged in parallel arrays. This specific structural layout significantly minimizes internal resistance and heat generation. It provides a robust electrical pathway optimized to withstand the sudden high-current startup spikes typical of high-torque brushed DC motors, electric drills, screwdrivers, and garden power tool retrofits.
Advanced Multi-Tier Safety Guardrails
The dedicated control chipset continuously monitors the real-time electrical metrics of each cell connection pad, stepping in instantly to open the circuit during hazardous conditions:
- Overcharge Safety Cutoff: Halts incoming current when individual cells cross peak thresholds to eliminate expansion or thermal hazards.
- Over-Discharge Safety Cutoff: Isolates the battery pack if cell voltage drops dangerously low, preventing irreversible cell death.
- Overcurrent & Short-Circuit Safety: Disconnects the output terminals within milliseconds during high-draw faults above 40A, shielding your wiring and batteries from catastrophic shorts.
Technical Specifications
- Hardware Version: REV 2.3
- Battery Configuration Compatibility: 4S (4 Cells connected in Series)
- Compatible Battery Chemistry: 3.7V Nominal Lithium (4.2V fully charged)
- Continuous Sustained Discharge Current: Up to 40A (Requires appropriate wire gauge and open airflow)
- Continuous Maximum Charging Current: Up to 20A
- Required Charging Voltage Feed: 16.8V – 17.2V DC
- Equalization Balancing Current: 100mA
- Onboard Power Hardware: 10x Nikos Low-RDS(on) Power MOSFETs
- Solder Pad Interface Topology: 0V (B-), 4.2V, 8.4V, 12.6V, 16.8V (B+), and shared Charge/Discharge terminals ($\ominus$, $\oplus$)
Applications
- Replacing defective battery protection circuits in 14.4V–16.8V cordless electric drills and impact drivers
- Designing custom compact battery modules for RC heavy vehicles, drones, and robotics platforms
- Portable high-capacity 16V field utility power stations and camping backup hubs
- Energy storage units for small off-grid solar kits, remote telemetry boxes, and 12V–16V LED lighting systems
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