If the charging speed can not reach the fast charge, if this situation is convenient, you can check whether the mobile phone system version number is the latest, if there is a prompt update can be updated to the latest version to observe and use to see if there is improvement.
If you use the original adapter and data cable, you can confirm whether there is damage to the liquid inlet, if not, you can try to switch the wall plug or plug to confirm whether it will be involved in the situation caused by external voltage instability, you can also check whether the data cable interface is dirty, you can clean it up. At the same time, try to avoid charging when the mobile phone is running software with a large amount of computing or when the mobile phone is at a high temperature, and confirm whether the charging speed is normal in standby state.
One plus seven pro is originally equipped with 30X fast charge, if the fast charge head is not around, you can only use an ordinary charger to charge.
It comes with fast charger, if there is no can be purchased