2S 3S 4S Li-ion BMS Protection Board 20A 40A 60A
2S 3S 4S Li-ion BMS Protection Board 20A 40A 60A
2S / 3S / 4S Lithium Battery BMS Protection Board — 20A / 40A / 60A
Keep your lithium-ion or lithium-polymer battery packs running safely and efficiently with this versatile Battery Management System (BMS) Protection Board. Compatible with 2S, 3S, and 4S series configurations and available in 20A, 40A, and 60A current ratings, this board is an ideal solution for DIY power tools, electric drills, e-bikes, RC vehicles, motors, and custom battery projects.
Key Features
- Wide Compatibility: Supports 2S (7.4V), 3S (11.1V / 12.6V), and 4S (14.4V / 16.8V) lithium-ion and lithium-polymer battery packs.
- Multiple Current Ratings: Choose from 20A, 40A, or 60A continuous discharge ratings to match your application's power demands.
- Overcharge Protection: Automatically cuts off charging when cells reach their maximum safe voltage, extending battery life.
- Over-Discharge Protection: Prevents cells from dropping below the safe minimum voltage threshold, protecting battery health.
- Overcurrent & Short-Circuit Protection: Instantly disconnects the load in the event of excessive current draw or a short circuit, keeping your equipment and batteries safe.
- Cell Balancing: Integrated balance function ensures all cells in the pack charge and discharge evenly for consistent performance and longevity.
- Compact & Easy to Install: Low-profile PCB design fits neatly into battery enclosures, tool packs, and custom builds.
- Broad Application: Suitable for electric drills, power tools, motors, e-scooters, solar storage, and more.
Specifications
- Cell Configuration: 2S / 3S / 4S
- Nominal Voltage: 7.4V (2S) | 11.1V (3S) | 14.4V (4S)
- Max Charge Voltage: 8.4V (2S) | 12.6V (3S) | 16.8V (4S)
- Continuous Current: 20A / 40A / 60A (select your option)
- Compatible Battery Types: Li-ion, Li-polymer (18650 and similar cells)
- Protection Functions: Overcharge, over-discharge, overcurrent, short circuit, cell balancing
What's in the Box
- 1 × BMS Protection Board (configuration per selected option)
For guidance on safe lithium battery handling and storage, refer to the U.S. Consumer Product Safety Commission (CPSC) Lithium Battery Safety Information.
Frequently Asked Questions
Q: What does a BMS (Battery Management System) protection board do for lithium battery packs?
A: A BMS protection board monitors and manages each cell in a lithium-ion or lithium-polymer battery pack. It actively prevents overcharging, over-discharging, overcurrent conditions, and short circuits, while also balancing cell voltages to ensure even charge distribution. This extends the usable life of your battery pack and keeps your devices and batteries operating safely.
Q: Which battery configurations and voltages does this BMS board support?
A: This BMS protection board supports 2S (7.4V nominal / 8.4V max), 3S (11.1V nominal / 12.6V max), and 4S (14.4V nominal / 16.8V max) series lithium-ion and lithium-polymer configurations. It is compatible with standard 18650 cells and similar lithium cell formats commonly used in power tools, drills, motors, and DIY battery packs.
Q: How do I choose between the 20A, 40A, and 60A current rating options?
A: Select the current rating based on the maximum continuous discharge current your application requires. For small motors or light-duty tools, 20A is typically sufficient. For mid-range electric drills and power tools, 40A provides a comfortable safety margin. For high-demand motors, e-bikes, or heavy-duty power tools, the 60A board ensures your BMS can handle peak loads without triggering protective shutdowns.
Q: Is this board compatible with 18650 lithium cells?
A: Yes. This BMS protection board is designed to work with standard 18650 lithium-ion cells as well as other Li-ion and Li-polymer cell formats arranged in 2S, 3S, or 4S series configurations. It is widely used in custom 18650 battery pack builds for tools, motors, and DIY electronics projects.