The M5GO Battery Bottom2 (for Core2 only) is an expansion base designed for M5Core2. It integrates an MPU6886 6-axis gyro/accelerometer, digital mic (SPM1423), and 500mAh LiPo battery. The base also includes 2 HY2.0-4P expansion ports capable of ADC/DAC/UART protocols and data input/output, which allows the use of units from the M5Stack range.