1. First, confirm whether it has short circuited and burned out. Do not use the method of charging it, nor the method of charging your phone with it. Instead, observe and smell it to see if there is smoke inside or if there is any deformation in the appearance due to high temperature. Use your nose to smell if there is a burning smell. If any of the above phenomena occur, it means that the power bank is burned out and you should not use it anymore;
If there is no such phenomenon, it means that the power bank may not have been burned out. Place it in a ventilated and dry place, such as a balcony, and let it slowly dry in the shade (about two or three days), or use a low heat level hair dryer to blow the charging and discharging ports of the power bank, and then place it on the balcony and let it continue to dry in the shade (about one day).
3. Finally, find an unimportant phone and try charging it. If it can be charged, let it charge until all the electricity inside is discharged, and then charge the power bank. However, pay attention to safety at the beginning. If there is an unpleasant smell, quickly unplug the charging head, cut off the power, and continue to dry it on the balcony in the shade