4S 40A 16.8V Lithium Battery Protection Board BMS Module with Balance
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৳ 120.00৳ 150.00 (-20%)
This high-current 4S 40A Lithium Battery Protection Board (BMS) manages and protects four series-connected 3.7V lithium cells (like 18650 or 26650 packs). It features an integrated cell-balancing circuit to maximize battery lifespan and safeguards your projects against overcharge, over-discharge, and overcurrent up to 40A.
High-Current 4S 40A Lithium Battery Protection Board with Balancing
Overview
This heavy-duty 4S 40A Battery Management System (BMS) module is engineered to protect, balance, and manage a 4-cell series configuration of 3.7V lithium-ion or lithium-polymer batteries (such as 18650, 21700, or 26650 cells). Offering a nominal voltage of 14.8V and a full charge voltage of 16.8V, this board delivers the high-current handling necessary for demanding applications while ensuring maximum safety and prolonged battery life.
Integrated Cell Balancing Circuit
Unlike basic protection circuits, this advanced BMS features built-in equalization functionality. As the battery pack nears full charge, the onboard balancing resistors actively bleed off excess voltage from higher cells, allowing weaker cells to catch up. This keeps all four cells tightly synchronized, maximizing the overall usable capacity of your pack and preventing premature battery degradation.
Robust Multi-Layer Hardware Protection
Equipped with a array of high-power MOSFETs and a precise control chipset, this module continuously monitors the electrical status of individual cells to protect against catastrophic failures:
- Overcharge Protection: Prevents dangerous over-pressurization and thermal runaway by cutting off charging when any cell reaches its limit.
- Over-Discharge Protection: Safely disconnects the load when cells drain too low, preventing irreversible capacity loss.
- Overcurrent & Short Circuit Safety: Instantly trips open if an electrical fault or a massive current spike occurs, protecting the wiring and cells.
Technical Specifications
- Battery Configuration: 4S (4 Cells in Series)
- Compatible Battery Type: 3.7V Nominal Lithium Cells (4.2V fully charged)
- Continuous Discharge Current: Up to 40A (ensure good heat dissipation)
- Continuous Charging Current: Up to 20A
- Charging Voltage Required: 16.8V – 17.0V DC
- Dimensions: 45mm x 60mm (1.77in x 2.36in)
- Wiring Connection Nodes: 0V (B-), 4.2V, 8.4V, 12.6V, and 16.8V (B+)
Applications
- High-power DIY electric drills, screwdrivers, and motor tools
- Custom battery packs for RC drones, cars, and robotics platforms
- Portable high-capacity 12V-16V field power banks
- Small electric scooters, e-bikes, and solar energy storage systems
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