How to ‘fast-charge’ your iPhone
Slow charging is an issue that iPhone users generally face. This problem is encountered by many iPhone users, especially those who are using devices launched before iPhone X, iPhone 8 and iPhone 8 Plus.
Fast-charging the iPhone is possible. One method requires buying another Apple product like Apple USB-C to Lightning cable or any of the 18W, 29W, 30W, 61W, or 87W USB-C power adapters. But there are other workarounds that may help you in charging your iPhone at a fast rate. These methods employ the use of devices that do not require you to cough up money for another Apple device to charge your Apple iPhone relatively faster.
Using 2A power bank
Most of the power banks that are available in the market today come with multiple USB ports. Some of them come with 1A power output while there are others that provide 2A output. To charge your iPhone at a relatively faster rate, using a 2A power bank will help.
Using Apple iPad charger
Apple iPad charger comes with a higher voltage rating compared to an Apple iPhone charger So, you can also fast-charge your iPhone with the help of an iPad charger provided you own an iPad also. Keep in mind that the latest iPad Pro (2018) comes with a USB Type-C port and hence, ships with a Type-C cable which cannot be used to even charge your iPhone.
Using any Android fast-charging adapter
Many Android phones these days come with fast charging support. Their charging cables would be of no use for an iPhone user but their adapters may come in use still. So, for fast charging the iPhone, an Android adapter will come in handy.
Note that iPhone X, XS and XS Max support fast charging by default and there is no need for the users to fall back upon the aforementioned methods.
Also note that the above methods are just a workaround and they can be used when you need to charge your iPhone at a fast rate when you are in a hurry.