4S 40A Li-ion Lithium Battery BMS | 12.6V 18650 Pack Protection & Charger Module
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High-current 4S BMS board for Li-ion 18650 battery packs
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Continuous discharge current up to 40A
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Supports cell balancing for extended battery life
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Protection against overcharge, over-discharge, overcurrent, and short circuits
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Suitable for electric scooters, e-bikes, DIY battery packs, and robotics
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Compact PCB design for easy integration
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Works with 3.6V–3.7V Li-ion cells, including 18650 and LiPo
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Built-in recovery function for enhanced safety and performance
360.00৳ 500.00৳
The 4S 40A Li-ion BMS is a robust solution for high-power battery packs. Designed to handle 12.6V packs, it provides automatic cell balancing during charging, protecting individual cells from overcharge and ensuring optimal performance. Its high continuous discharge rating (40A) makes it ideal for power-intensive applications like e-bikes, scooters, or DIY power tools.
Students, hobbyists, and engineers prefer this BMS for battery pack safety, long-term durability, and stable output, making it one of the most reliable options for Bangladesh electronics projects.
FAQs
Q1: Can it be used for e-bike batteries?
Yes, it is perfect for medium-to-high power 4S 18650 battery packs.
Q2: Does it balance cells automatically?
Yes, the BMS automatically balances cell voltages during charging.
Q3: What safety features are included?
Includes overcharge, over-discharge, overcurrent, and short-circuit protection.
Specification Table
| Parameter | Value |
|---|---|
| Battery Configuration | 4S (4 cells in series) |
| Nominal Voltage | 14.8V (4 × 3.7V) |
| Maximum Charge Voltage | 16.8V |
| Continuous Discharge Current | 40A |
| Peak Discharge Current | ~50–60A (short bursts) |
| Balance Function | Automatic cell voltage equalization |
| Protections | Overcharge, over-discharge, overcurrent, short circuit |
| Applications | E-bikes, scooters, robotics, DIY battery packs |
| PCB Size | ~60 × 55 × 3.5 mm |
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