4S 20A BMS Protection Board HX-4S-A20 Rev 1.1 for 14.8V 16.8V 18650 Li-ion Battery Packs

The HX-4S-A20 Rev 1.1 4S 20A BMS Protection Board is a reliable lithium battery management system designed for 4-cell (4S) 18650 Li-ion battery packs. This protection board provides advanced safety features including overcharge protection, over-discharge protection, overcurrent protection, and short-circuit protection to ensure safe and stable battery operation.

Designed for 14.8V nominal and 16.8V fully charged lithium battery packs, this BMS module supports up to 20A continuous current, making it suitable for DIY battery packs, portable power systems, robotics, solar projects, LED backup systems, electric vehicles, and other high-power lithium battery applications.

The compact design and stable performance make it ideal for makers, engineers, hobbyists, and battery pack builders looking for efficient battery protection and charging management.

Features

• Supports 4S 18650 lithium-ion battery packs
• 20A continuous current output
• Overcharge protection
• Over-discharge protection
• Overcurrent and short-circuit protection
• Stable charging and discharging performance
• Compact and lightweight PCB design
• Suitable for DIY battery pack projects

Specifications

• Model: HX-4S-A20 Rev 1.1
• Battery Type: Li-ion 18650
• Battery Configuration: 4S
• Nominal Voltage: 14.8V
• Full Charge Voltage: 16.8V
• Maximum Current: 20A
• Overcharge Detection Voltage: 3.90V ±0.25V
• Overcharge Release Voltage: 3.80V ±0.05V
• Over-discharge Detection Voltage: 2.0V ±0.08V
• Low Power Consumption
• PCB Protection Circuit Included

Applications

• DIY lithium battery packs
• 18650 battery management systems
• Portable power banks
• Electric bicycles and scooters
• Robotics power systems
• Solar energy storage projects
• LED emergency backup systems
• UPS battery protection circuits