StampS3 GroveBreakOut is a specialized expansion board designed for the M5StampS3, equipped with six Grove interfaces and compatible with M5’s portA/B/C standards, including I2C, IO (input/output), and UART interfaces. This board features an integrated holder for 16340/18350 lithium batteries, along with a 1.25mm@2P lithium battery connector, enabling it to independently power the entire system. It also includes switches for battery power supply and for switching between USB and battery power. Onboard touch switches are connected to the EN pin for reset control. Additionally, the board is equipped with a lithium battery charging chip and a 5V boost system, as well as a circuit for monitoring battery levels, providing a stable and reliable energy solution. Pre-arranged mounting holes make installation straightforward. This product is suitable for educational and prototype development, Internet of Things (IoT) projects, wearable devices, automation, and robotics among other fields.