2S 20A BMS – 18650 Lithium Battery Protection Board Module

The 2S 20A BMS is a reliable 18650 lithium battery protection board designed to manage and safeguard 2-cell (2S) lithium-ion battery packs efficiently. It actively monitors voltage and current, therefore helping prevent common battery failures during charging and discharging.

This 2S 20A BMS continuously controls the battery pack and instantly reacts when unsafe electrical conditions occur. For example, it stops charging when the voltage exceeds safe limits and disconnects the load when the battery voltage drops too low. As a result, your lithium cells remain protected and stable throughout their operating life.

Moreover, the board supports up to 20A continuous discharge current, so it works well in applications that demand moderate to high power output. Because of its precise voltage detection, the 2S 20A BMS reduces the risk of overheating, swelling, or permanent cell damage. Additionally, short-circuit and over-current protection improve overall system safety.

The compact PCB layout allows easy installation in battery enclosures where space is limited. Therefore, makers, technicians, and developers can integrate this module into portable power systems, DIY battery packs, robotics projects, backup power units, and electronic prototypes without difficulty.

Furthermore, the board supports passive cell balancing, which ensures both lithium cells charge evenly. Consequently, battery efficiency improves and the usable lifespan increases. Instead of relying on external monitoring, this 2S 20A BMS automatically handles protection tasks, so users can focus on performance and reliability.

Whether you build custom battery packs or upgrade existing systems, this 2S 20A BMS delivers dependable protection. Overall, it provides a practical balance between safety, performance, and ease of use, making it a smart choice for lithium battery management applications.

Key Features of 2S 20A BMS

• Dedicated 2S 20A BMS for 18650 lithium-ion battery packs

• Protects against overcharge, over-discharge, over-current, and short circuit

• Supports up to 20A continuous discharge current

• Enhances battery safety and extends cell lifespan

• Compact PCB design for easy installation

Technical Specifications

• Battery Type: 18650 Lithium-ion

• Battery Configuration: 2S (2 cells in series)

• Nominal Voltage: 7.4V

• Maximum Charge Voltage: 8.4V

• Continuous Discharge Current: 20A

• Overcharge Detection Voltage: ~4.25V per cell

• Over-discharge Detection Voltage: ~2.5V per cell

• Short Circuit Protection: Supported

• Balancing: Passive balancing

Bullet Points:

• Reliable 2S 20A BMS for lithium battery safety

• Designed for 2-cell 18650 battery packs

• Protects batteries from electrical damage

• Ideal for DIY, robotics, and power applications

• Compact, efficient, and easy to integrate