How can I Quickly charge my iPhone
The iPhone's battery life is pretty decent, especially in the iPhone 7, but to get to 100% can often take just a bit too long.
When you charge an iPhone, iPad, or computer, you're resupplying its battery (measured in watt-hours) from a power source like a wall outlet, usually via an adapter. That adapter controls how much power you can get (volts) from that outlet, and the speed at which you get it (amps). Those two factors multiplied result in the adapter's total available power.
The adapter that comes with your iPhone is a 5W adapter, which charges your iPhone with 5V at 1A. The iPhone 6 and later can actually accept up to 2.1A.
The 12W iPad adapter charges with 5V at up to 2.4A, so it effectively doubles the current of the standard iPhone charging adapter.
So if you have an iPhone 6 or 7 consider buying an iPad 12W adapter. Of course check with Apple before trying this.