🔋 12.6V 3S 20A BMS Protection Circuit Board – for 18650 Battery Packs
This 3S 20A BMS (Battery Management System) is designed for high-drain applications using 3-series (3S) 18650 lithium-ion battery packs. It ensures safe charging, discharging, and protection against electrical faults, making it ideal for demanding projects like power tools, robotics, drones, and e-bikes.
✅ Key Features:
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Battery Support: 3 x 18650 Li-ion cells (3S configuration)
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Nominal Voltage: 11.1V (fully charged: 12.6V)
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Continuous Discharge Current: 20A
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Peak Discharge Current: Up to 40A (short bursts)
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Charging Voltage (max): 12.6V
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Overcharge Protection: ~4.25V ± 0.05V per cell
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Over-discharge Protection: ~2.5V ± 0.1V per cell
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Overcurrent Protection: Yes
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Short-circuit Protection: Yes
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Temperature Protection: Usually not included in budget versions
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Battery Balancing: Optional (many budget versions do not include it)
⚙️ Pin Configuration:
| Label | Description |
|---|---|
| B+ | Connect to battery pack positive terminal |
| B- | Connect to battery pack negative terminal |
| B1 | Connect between Cell 1 and Cell 2 |
| B2 | Connect between Cell 2 and Cell 3 |
| P+ | Load/Charger Positive Output |
| P- | Load/Charger Negative Output |
🛡️ Protection Features:
| Protection Type | Purpose |
|---|---|
| Overcharge | Stops charging beyond safe voltage |
| Over-discharge | Prevents cell damage due to low voltage |
| Overcurrent | Protects against high discharge current |
| Short-circuit | Disables output on short-circuit |
Note: This BMS does not include active balancing unless specifically mentioned.
🛠️ Typical Applications:
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High-drain DIY 12.6V lithium-ion battery packs
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Robotics and automation systems
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E-bikes, e-scooters, drones
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Solar-powered systems
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Power tools and backup batteries
📦 Package Contents:
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1 × 3S 20A BMS Protection Board (bare board, no wires)
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