22.5W Fast Charging Protection Board for 3.7V Lithium Batteries

This efficient charging protection board offers up to 22.5W output power with an impressive efficiency up to 96%. Its compact size suits various DIY industrial projects, supporting 3.7V lithium batteries such as polymer, 18650, and 21700 types.

Designed exclusively for parallel battery connections, it safeguards battery health by preventing aging, though series connections are not allowed to avoid damage.

Equipped with a wide range of mainstream fast charging protocols, this board supports PD3.0, PD2.0, QC4+/QC4, QC3.0, QC2.0, FCP, SCP, HSCPS, SFCP, AFC, and PE1.1, making it compatible with many devices and chargers.

• Automatic load and light load detection
• High-current USB output interface with small current mode
• Digital tube display and LED power indicators for status monitoring

The board includes advanced safety mechanisms such as output overcurrent, short circuit protection, charge timeout, and over-voltage protection to ensure stable and secure charging during operation.

Use thick, short cables capable of handling 7-10A current to maintain stable power delivery. Battery connections must be soldered—not twisted—to avoid power loss. Only connect 3.7V batteries in parallel; series connections will damage the board and void its functioning.

• Ensure proper polarity to prevent reverse connection damage
• Use appropriate cable thickness and length for fast charging

• Output Power: 22.5W
• Efficiency: Up to 96%
• Charging Current: Up to 5A
• Supported Battery Types: 3.7V polymer, 18650, 21700 lithium batteries
• Fast Charging Protocols: PD3.0/PD2.0, QC4+/QC4/QC3.0/QC2.0, FCP, SCP, HSCPS, SFCP, AFC, PE1.1

Includes one mini fast charging module ready for integration into DIY power bank projects or other lithium battery applications.