Thank you for your support of Xiaomi. On the Xiaomi 15T Pro, the device can not power on immediately when connected to a charger if the battery level is below the required threshold. In this case, the phone will display a low-battery charging screen instead of activating normally.
This is part of the device's low-battery protection mechanism. The system ensures the battery reaches a safe operating level before starting the normal power-on process, preventing errors or potential damage during startup.
Once the battery has enough charge, the phone powers on normally. To avoid delays, use a compatible charger and let the device charge uninterrupted until the battery reaches the minimum safe voltage. This ensures stable operation and maintains the long-term performance of both the battery and the device.