Normal. Why else would the wireless charger have a fan. The meter 10 wireless charge is still the fastest, the faster the charge, the more heat, if not necessary, the app can be turned off, the meter 10 and the genuine charger have good heat dissipation capacity, so don't worry. If it is hot, it is recommended to stop the input and output of the mobile power supply.
Introduction: Mi mobile power supply supports input high voltage protection, input anti-reverse protection, output overcurrent protection, output overvoltage protection, output short circuit protection, battery overcharge and overdischarge protection, battery PTC protection, charging\/discharging temperature protection.