3S 18650 Lithium Battery BMS Protection Board 12.6V 15A
3S 18650 Lithium Battery BMS Protection Board 12.6V 15A
3-Series 18650 Lithium Battery Protection Board (BMS) – 12.6V, 15A
Keep your 3-series 11.1V/12V lithium battery packs running safely and efficiently with this compact Battery Management System (BMS) protection board. Designed for 18650 lithium cell configurations, this board provides reliable overcharge, over-discharge, and overcurrent protection along with active cell balancing — all in a small SMD package that fits neatly into DIY battery builds, alarm systems, and electronics projects.
Key Features
- 3S Configuration: Supports three 18650 lithium cells in series (11.1V nominal / 12.6V fully charged)
- 15A Continuous Discharge Current: Handles demanding loads with stable current delivery
- Overcharge Protection: Automatically cuts off charging when cells reach full capacity (4.2V per cell), extending battery life
- Over-Discharge Protection: Prevents cells from draining below safe voltage thresholds, preserving cell health
- Overcurrent & Short-Circuit Protection: Instantly disconnects on abnormal current spikes to keep your project and cells safe
- Cell Balancing: Actively equalises voltage across all three cells for uniform charge distribution and a longer overall pack lifespan
- Compact SMD Package: Easy to integrate into tight battery enclosures and custom builds
- Condition: Brand new
Specifications
| Configuration | 3 Series (3S) |
| Nominal Voltage | 11.1V / 12V |
| Max Charge Voltage | 12.6V |
| Continuous Current | 15A |
| Package Type | SMD |
| Quantity | 1 piece |
| Country of Origin | Made in China |
Who Is This For?
This protection board is ideal for hobbyists, electronics engineers, and makers building or repairing 3S lithium battery packs for alarm systems, power tools, portable electronics, RC vehicles, DIY power banks, and other 12V applications.
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Frequently Asked Questions
Q: What does a 3S BMS protection board do for my 18650 lithium battery pack?
A: A 3S BMS (Battery Management System) protection board monitors and controls your three-cell series lithium pack. It prevents overcharging (above 4.2V per cell), over-discharging (below safe cutoff voltage), overcurrent, and short circuits. The built-in balancing function also keeps all three cells at equal voltage levels, maximising pack capacity and longevity.
Q: Is this board compatible with standard 18650 lithium cells?
A: Yes. This protection board is specifically designed for 3-series (3S) 18650 lithium-ion cells with a nominal voltage of 11.1V/12V and a full-charge voltage of 12.6V. It supports up to 15A continuous discharge current, making it suitable for most common 3S pack applications.
Q: How do I wire this protection board into my battery pack?
A: The board has clearly labelled connection points for B- (battery negative), B+ (battery positive), and the balance taps for each cell. Connect each cell's positive terminal to the corresponding balance tap, link the pack's main positive and negative terminals to B+ and B-, and connect your load/charger to the output terminals (P- and P+). Always follow the board's wiring diagram for safe installation.
Q: Can this BMS board be used in alarm systems?
A: Yes. The board is listed with alarm system compatibility. Its stable 12V output and built-in protection features make it well-suited for powering alarm system battery backups and similar low-to-medium current 12V applications.