JellyAgent

Adding a Lithium Battery + 4G Module + Power Switch to the Lichuang Practical ESP32-S3 Development Board

Project Summary

Based on the Real-Combat ESP32-S3 development board, this build adds lithium battery management, a 4G communication module, and a self-lock power switch to achieve true zero power draw when off. The system can connect to the AI assistant over Wi-Fi or 4G.

Features

• Add a 4G module and update the open-source XiaoZhi software to support it.
• Integrate lithium battery charging and management.
• Use a self-lock power switch for zero standby power when off.
• Expose a capacitive touch interface (software not yet implemented).
• Remove the camera feature to simplify the build.
• Reinforce the enclosure to house the battery and 4G module.

Schematic PCB and 3D files

Board: Real-Combat ESP32-S3 development board. See the original post for the preview and editor link.

Download Schematic, PCB and 3D Files (RAR)

Software Code

Repository: https://github.com/herryyueqq/-4g-

Notes

• Two fly wires are present on the board.
• Fly wire #1 routes main input power to the charging circuit.
• Fly wire #2 puts 4G module power behind the switch to ensure zero draw when off.

Assembly Steps

1. Install the 4G module and battery onto the board.
2. Place the board into the front shell; position the 4G module, battery, and antennas.
3. Mount the display and apply the adhesive.
4. Use a glue gun to secure the 4G module, battery, and wiring.
5. Install the back shell and fasten screws.
6. Attach the power button cap. See the Bilibili video for a full walkthrough.

Product Images