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How to charge your smart phone and other USB devices as quickly as possible?

How to charge your smart phone and other Charging Station as quickly as possible? 

USB charging is shrouded in mystery — which is a bit ironic, given that almost all of us rely on USB charging of our smart phones and tablets on a daily basis. Why, for example, does an iPhone recharge quickly when you plug it into your MacBook Pro, but slowly when you plug it into your PC, or a non-Apple wall charger? Why does your smartphone charge quickly to start with, but slow down as it fills up? In this story we will answer these questions and more as we investigate the optimum methods of charging your USB devices as quickly as possible. We will also be taking a look at a new device. Called YCCTEAM USB Charger

Why your smartphone charges slowly

In general, there are two key factors that affect how quickly your device charges over USB: The maximum amperage of the USB socket or wall charger, and how your device negotiates power delivery from the socket/charger.

For a start, every charger or socket has a max amperage — usually between 500 milliamps (mA) and 1.5 amps (A). In general, unless it says otherwise, your laptop and PC are probably outfitted with 500mA sockets (unless they’re USB 3.0, in which case they’re probably 900mA). The max amperage of a wall charger varies, but can usually be found written somewhere on the charger — generally it’ll be between 0.5A and 2.1A. The max amperage dictates one thing only: The max theoretical charging rate of your device

It is through negotiation that your device actually decides how much power it wants to draw. When you plug your device into a charging socket or wall charger, the USB controller in your device talks to the USB controller attached to the socket/wall charger — or, if no controller is available, the device reads the voltage flowing across the four USB pins. From this data, your device decides how much amperage to draw, and thus how quickly it will recharge.