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The 3 Series 40A 18650 Lithium Battery Protection Board is a robust 3S BMS solution designed to safeguard lithium-ion packs while delivering stable performance for demanding applications. Operating at 11.1V / 12.6V, it ensures reliable overcharge, over-discharge, and overcurrent protection, making it suitable for drill motors, sprayers, LED systems, and DIY energy storage projects.
This compact board measures just 60 × 41 × 3.5 mm and supports common lithium battery types including 18650, 26650, and polymer lithium cells (3.6V / 3.7V nominal voltage). The 3 Series 40A 18650 Lithium Battery Protection Board is engineered for both hobbyists and professionals who require a stable, long-lasting BMS for power tools and portable electronics.
🔧 Key Features
- 3S Lithium battery protection module with balance and auto recovery
- Continuous discharge up to 40A, charge current up to 20A
- Supports 3.6V / 3.7V lithium cells including 18650 and 26650
- Overcharge, over-discharge, and overcurrent protection
- Compact design with efficient heat dissipation
- Ideal for drill motors, low-power inverters, and DIY energy solutions
📐 Technical Specifications
| Product Name | 3 Series 40A 18650 Lithium Battery Protection Board |
| Configuration | 3S (3 Cell) Li-ion Battery Pack |
| Operating Voltage | Nominal 11.1V, Max 12.6V |
| Overcharge Detection | Approx. 4.25V ± 0.025V per cell |
| Over-discharge Cutoff | Around 2.50V ± 0.08V per cell |
| Continuous Discharge Current | 40A (reduce load in poor cooling conditions) |
| Charge Current | Up to 20A |
| Balancing Current | ~100mA |
| Start-up Current Limit | Supports motors below 80A startup current |
| Power Handling | Up to 135W for drill motors |
| Operating Temperature | -40°C to +85°C |
| Dimensions | 60 × 41 × 3.5 mm |
| Weight | Approx. 9 g |
📌 Applications
- Battery packs for power drills and DIY tools
- LED lighting and portable electronic projects
- RC models and robotics requiring 3S lithium packs
- Low-power inverter systems
- Custom lithium-ion battery protection with balancing
💡 Why Choose This Product?
The 3 Series 40A 18650 Lithium Battery Protection Board combines high current capability, automatic recovery, and balancing functions to maximize performance and safety. Its compact design, stable MOSFET-driven protection, and wide compatibility make it a dependable choice for high-drain lithium-powered devices.
📦 Package Includes
- 1 × 3 Series 40A 18650 Lithium Battery Protection Board
⚠️ Note
- Successful drill startup requires three 15C–20C power batteries, or six 10C–15C power batteries. Standard 18650 cells may not be sufficient.
- Strictly follow wiring sequence (0V, 4.2V, 8.4V, 12.6V, 16.8V). Do not short circuit intentionally.
- When used with a brushed motor, connect a non-polar capacitor (25V+, 10µF–100µF) across the terminals to prevent reverse spikes damaging the MOSFETs.
- When assembling series packs, ensure each group of cells is balanced before use. A faster voltage drop indicates a weak cell group.
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