Not really. iqoo only capsule head can fast fill no. If you are using a regular plug-in, it depends on whether your charger is original or non-original. When using the original charger, it makes no difference whether you plug in the power supply or the phone first. Charging with a non-original charger, plug in the phone first, and then plug in the power supply, it will produce a relatively large voltage pulse, which may bring harm to the phone.