Getting a flat tire on a ride is always nerve-wracking. Can the portable, automatic Xiaomi Mijia Air Pump completely replace manual pumps and CO2 cartridges? This test focuses on the core pain points for road cyclists: we fully deflate a 700c tire and measure the time and battery consumption needed to inflate it to over 100 PSI. We also check the Presta valve fit and adapter feel, and record the noise and heat buildup at the metal connector during extended high-pressure operation. Is this compact device with a digital display and auto-stop function a lifesaver in practice, or a hot burden?