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5S 15A 18650 Li-ion Lithium Battery BMS Charger Protection Board – 18V / 21V Battery
The 5S 15A 18650 Li-ion Lithium Battery BMS board is a high-quality protection module designed to safeguard 18V and 21V battery packs from overcharging, over-discharging, and overcurrent damage. It enhances safety, efficiency, and battery lifespan, making it essential for both DIY and industrial lithium-ion applications.
Built with durable MOSFETs and precision circuits, the 5S 15A 18650 Li-ion Lithium Battery protection board offers automatic recovery, short-circuit protection, and low quiescent current. Its compact PCB design allows seamless integration into battery-powered projects like e-bikes, cordless tools, and energy storage packs.
🔧 Key Features
- Designed for 5-cell (5S) 18650 Li-ion packs, 18V/21V
- Supports up to 56 A charging and 15 A discharge
- Multi-layer safety: overcharge, over-discharge, and overcurrent protection
- Short-circuit protection with automatic reset
- Energy-efficient standby mode with ~30 μA current
- Durable, compact PCB with high-quality MOSFETs
📐 Technical Specifications
| Product Name | 5S 15A 18650 Li-ion Lithium Battery BMS Charger Protection Board |
| Cell Configuration | 5 Series (5S) 18650 Li-ion cells |
| Supported Voltage | 18V / 21V battery packs |
| Nominal Charge Voltage | 21 V |
| Charge Current | Up to 56 A peak |
| Continuous Discharge | 15 A rated |
| Overcurrent Protection | 50 / 55 / 60 A cutoff |
| Protection Delay | 20 / 25 / 30 ms |
| Overcharge Detection | 4.18–4.22 V per cell |
| Overcharge Recovery | 4.05–4.15 V per cell |
| Over-discharge Detection | 2.75–2.85 V per cell |
| Over-discharge Recovery | 2.90–3.20 V per cell |
| Quiescent Current | ~30 μA typical |
| Operating Temperature | -20°C to +70°C |
| PCB Dimensions | Approx. 60 × 20 mm |
| Efficiency | >95% under rated load |
| Board Weight | ~15 g |
| Protections | Overcharge, over-discharge, overcurrent, short-circuit, temperature |
📌 Applications
- DIY 18V/21V Li-ion battery packs
- E-bike and scooter battery safety systems
- Cordless tool and drill battery modules
- Portable energy storage projects
- Solar and backup power battery management
💡 Why Choose This Product?
The 5S 15A 18650 Li-ion Lithium Battery BMS board delivers multi-layer protection, high efficiency, and long-term reliability. It is built to handle demanding loads while ensuring stable battery operation and extended cycle life.
📦 Package Includes
- 1 × 5S 15A 18650 Li-ion Lithium Battery BMS Charger Protection Board
- 1 × Connector Cable
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