Mini USB-C Li-Ion Charging Module for 3.7 V / 4.2 V Batteries

Mini charging module with a USB Type-C interface is a practical solution for charging 3.7 V / 4.2 V lithium batteries, including popular 18650cells. Its small size makes it ideal for compact electronics projects and devices where space is limited.

The module operates from a 5 V DC input and provides a maximum charging current of up to 600 mA. Charging uses the CC/CV (constant-current / constant-voltage)method for efficient, controlled charging. The module also features thermal regulationto help prevent overheating during operation.

It also supports automatic recharging and charge-current monitoring, which can help track charging status. The maintenance-charge threshold is 2.8 V and the charge termination voltage is 4.2 V ±1%.

Module status is shown by LED indicators:

• the module is ready when power is connected,
• a charging indicator illuminates during charging,
• a full-charge indicator illuminates when charging is complete.

This module is suitable for devices such as:

• power banks,
• Bluetooth earphones,
• smartwatches,
• compact portable electronics,
• DIY projects using Li-ion batteries.

Technical specifications:

• Charging interface: USB Type-C
• Input voltage: DC 5 V
• Maximum charging current: 600 mA
• Charge termination voltage: 4.2 V ±1%
• Maintenance-charge threshold: 2.8 V
• Dimensions: 7.6 × 10 mm