18650 3S 20A 12.6V Lithium BMS Battery Protection Board for Li-ion Battery

The 3S 20A Lithium BMS is a reliable battery protection solution designed for 3-series (3S) 18650 lithium-ion battery packs. This board plays a critical role in ensuring battery safety by controlling charging, discharging, and current flow while protecting each cell from electrical faults.

Built to support a maximum charge voltage of 12.6V and a continuous discharge current of 20A, this lithium BMS board is suitable for DIY battery packs, power backup systems, robotics, solar storage, and portable electronic devices. It helps prevent common battery issues such as over-charging, over-discharging, over-current, and short circuits.

Thanks to its compact PCB design, the board can be easily integrated into custom battery assemblies using standard 18650 lithium-ion cells. Whether you are a hobbyist assembling your own battery pack or a professional developing energy solutions, this BMS board provides dependable protection and stable performance.

Key Features of 3S 20A Lithium BMS

• Designed for 3S lithium-ion battery configurations

• Supports up to 20A continuous discharge current

• Protects against over-charge, over-discharge, and short circuit

• Improves battery lifespan and operational safety

• Compact and lightweight PCB design

• Ideal for DIY battery packs and energy projects

Battery Protection for 18650 Lithium Cells

This lithium battery protection board continuously monitors individual cell voltage levels to ensure safe operation. It disconnects the load or charger automatically when unsafe conditions are detected, helping to reduce battery damage and improve overall reliability.

Technical Specifications

Electrical Performance Details

• Battery Type: Lithium-ion (18650)

• Battery Configuration: 3S

• Maximum Charge Voltage: 12.6V

• Continuous Discharge Current: 20A

• Charge Current: Up to 10A

• Over-Charge Protection: 4.25 ± 0.05V per cell

• Over-Discharge Protection: 2.5 ± 0.1V per cell

Physical Dimensions and Build Quality

• Board Material: FR-4 PCB

• Connection Type: Solder pads

• Operating Temperature: –20°C to 60°C

Applications of 3S Lithium Battery BMS

• DIY 18650 lithium battery packs

• Backup power and UPS systems

• Robotics and automation projects

• Solar and portable energy storage

• Electric tools and custom electronics

Bullet Points

• High-quality 3S 20A Lithium BMS for 18650 battery packs

• Ensures safe charging and controlled discharging

• Protects batteries from voltage and current faults

• Compact, lightweight, and easy to install

• Suitable for DIY, robotics, and power storage projects