4S 30A Li-ion 18650 Battery Protection Board BMS 14.8V
4S 30A Li-ion 18650 Battery Protection Board BMS 14.8V
4S 30A Lithium Battery Protection Board Module – 14.4V / 14.8V / 16.8V
Keep your 4-cell lithium-ion battery packs running safely and efficiently with this high-current 4S 30A BMS (Battery Management System) Protection Board. Designed for 18650 Li-ion battery packs, this compact SMD module provides robust electronic protection against overcharge, over-discharge, over-current, and short-circuit conditions — making it an essential component for DIY battery packs, power tools, e-bikes, laptops, and more.
Key Features
- 4S Configuration: Supports 4 cells in series for nominal voltages of 14.4V, 14.8V, and up to 16.8V fully charged.
- High Current Rating: Continuous current of 15A with a maximum burst current of 30A — ideal for demanding applications.
- Overcharge Protection: Automatically cuts off charging when cells reach their maximum safe voltage, extending battery lifespan.
- Over-Discharge Protection: Prevents cells from dropping below safe voltage thresholds to protect cell integrity.
- Short-Circuit Protection: Instantly disconnects the circuit in the event of a short, safeguarding your battery pack and connected devices.
- Over-Current Protection: Monitors load current and disconnects when unsafe levels are detected.
- Wide Operating Temperature: Rated for -40°C to +85°C, suitable for harsh environments.
- SMD Package: Compact surface-mount design for easy integration into custom battery pack builds.
- Compatible with 18650 Cells: Works seamlessly with standard 18650 Li-ion battery cells.
Specifications
| Configuration | 4S (4 cells in series) |
| Continuous Current | 15A |
| Max Burst Current | 30A |
| Supply Voltage | 14.4V / 14.8V / 16.8V |
| Operating Temperature | -40°C to +85°C |
| Package Type | SMD |
| Quantity | 1 Module |
| Condition | New |
| Country of Origin | Made in Mainland China |
What's in the Box?
- 1 × 4S 30A Li-ion Battery Protection Board Module
Perfect For
- DIY 18650 battery pack builds
- Laptop & computer battery replacements
- Power tools and electric vehicles
- Robotics and electronics projects
- RC vehicles and portable power stations
Looking for more electronics and DIY tools? Check out our Electromagnetic Induction Tester – Coil & Circuit Fault Detector and our Air Compressor Pressure Gauge – DIY Tool for your workshop needs.
Learn more: ENERGY STAR product efficiency guidance
Frequently Asked Questions
Q: What does a 4S 30A lithium battery protection board do?
A: A 4S 30A BMS (Battery Management System) protection board monitors and manages a 4-cell series lithium-ion battery pack. It protects against overcharge, over-discharge, over-current, and short-circuit conditions, ensuring the battery pack operates safely and maintains a longer service life.
Q: Is this protection board compatible with 18650 Li-ion battery cells?
A: Yes, this module is fully compatible with standard 18650 Li-ion cells wired in a 4S (4 series) configuration, supporting pack voltages of 14.4V, 14.8V, and 16.8V depending on cell chemistry and charge state.
Q: What is the maximum current this board can handle?
A: The board supports a continuous discharge current of 15A and a maximum burst current of 30A, making it suitable for high-demand applications such as power tools, e-bikes, and robotics.