Fast charging an iPhone requires a USB PD charger and a Type C Lightning cable. No exceptions.
As of late I’ve been bugged by the fact that no one knows how to “fast charge” an iPhone. And no, despite what you hear, using a Samsung “fast charger” will not have any effect on your iPhone.
Many people are confused about this issue because all the phone manufacturers use differing standards—which ends up being unhelpful. Simply using any third-party charger that claims to fast charge your iOS device doesn’t work, because these chargers are built for Android devices with Qualcomm chips.
Fast charging an iPhone has 3 distinct requirements:
- An iPhone 8, iPhone 8 Plus or iPhone X
- A USB Type C to Lightning cable
- A USB PD (Power Delivery) compliant charger
And these chargers do not work:
- Qualcomm based Quick Charge 3.0 or QC 2.0 chargers
- Using a standard USB Type A to Lightning cable
- Using an iPhone older than the iPhone 8
While Apple is late to the fast charging game, it’s very strict regarding the type and quality of chargers that are able to juice up your device quickly.
Here’s a link to the Apple Knowledge Base article regarding fast charge.