Is 1 A fast charging for iPhone ?

The answer to this question is a resounding "no." Currently, Apple does not officially support 21-amp fast charging for any iPhone model. The highest wattage charger that Apple offers for their iPhones is the 18-watt USB-C power adapter, which can deliver up to 9 volts at 2 amps. While some third-party accessories may claim to support 21-amp fast charging for iPhones, using these accessories may void your device's warranty and pose potential risks such as overheating or damaging the battery. Therefore, it is recommended to stick to Apple-certified chargers or those from reputable brands.

The future of fast charging for iPhones is uncertain, but it is safe to say that technology is constantly evolving, and it is possible that Apple may introduce faster charging solutions in the future. However, it is important to remember that charging speed is just one aspect of a phone's overall performance, and there are limitations to how fast a device can charge without affecting battery health or compromising safety. It's important to always use certified chargers and to avoid using third-party accessories that may pose a risk to your device's warranty.