We are sorry for the inconvenience you were caused. The POCO F7 Pro features the instant power on function. The instant power on function requires the battery voltage to meet certain preset conditions before it can be turned on. When the phone is out of power for a long time, it needs to be plugged into a charger for a while to use the instant power on function.
Additionally, instant power on has different performances for different chargers. It is recommended to use the official standard charger, PD charger or QC charger. This will make the charging process faster and more efficient. And please upgrade to the latest system.