Solutions:
Micro USB output of Mi/ REDMI mobile phone is 5V 500mA. Theoretically, power supply can be realized as long as the requirement of electrical equipment is lower than 5V 500mA.
Note:
1. Even if the power supply is enough, incompatibility will cause power failure.
2. Power supply of mobile phones to other devices via OTG cable will seriously increase power consumption and heat of the motherboard, which is not recommended.