It is normal for Xiaomi charging treasure to be hot. [Any electrical appliance will generate heat and will be hot] Suggestion: 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.