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Product Description
4S 20A 18650 BMS Protection Board is a compact and high-efficiency lithium battery management module designed for 4-series 18650 Li-ion battery packs. It provides complete safety features including overcharge protection, over-discharge protection, cell balancing, and short-circuit protection, making it ideal for power storage, robotics, solar systems, e-bikes, and DIY battery projects.
🔧 Key Features
- ⚡ Supports 4S (4 cells in series) Li-ion battery packs
- 🔋 High 20A continuous discharge current
- 🛡️ Overcharge, over-discharge & short-circuit protection
- 🔥 MOSFET-based high-efficiency switching
- 🎯 Built-in cell balancing functionality
- 📐 Compact rounded-square PCB design
- 🌡️ Stable operation across wide temperature range
- 🔌 Ideal for custom lithium battery projects
📊 Technical Specifications
| Focus Keyword | 4S 20A 18650 BMS Protection Board |
| Battery Type | 18650 Li-ion / 3.7V cells |
| Configuration | 4S (4 cells in series) |
| Continuous Discharge Current | 20A |
| Instantaneous Peak Current | 30–35A (varies) |
| Overcharge Voltage | 4.25V ± 0.025V per cell |
| Over-discharge Voltage | 2.80V ± 0.05V per cell |
| Overcurrent Protection | Yes (auto cutoff) |
| Short-Circuit Protection | Yes (MOSFET based) |
| Balance Function | Yes, automatic balancing |
| Balance Current | 40–60mA |
| Charging Voltage | 16.8V (max) |
| PCB Thickness | 1.2–1.6mm |
| Operating Temperature | -20°C to +60°C |
| Dimensions | ≈ 45mm × 45mm |
🛠️ Applications
- 🚲 Electric bikes and scooters
- 🔆 Solar energy storage packs
- 🤖 Robotics and automation
- 📦 Portable battery packs
- 🔋 DIY 4S 18650 lithium battery systems
📦 Package Includes
- 1 × 4S 20A 18650 BMS Protection Board
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