Wireless charging might seem like magic but it is purely physics. Wireless charging uses an electromagnetic field to transfer energy between two objects through an electromagnetic induction. Induction is achieved by placing a device which is equipped with the induction coil directly onto a dedicated charging station (or a charging pad).
In the past few years, different mobile phone manufacturers had developed different wirelesss charging technologies to be used in their devices. However, the entire mobile industry is now using Qi (pronounced "chee") wirelesss charging standards.
The only difference in wireless charging is that there is no physical wire connecting your device with the power source. Just like normal charging, wireless charging can also be peformed at different rates. The normal power output of a wireless Qi charging pad is 5W. Fast chargers have also been developed that can pump up to 15W of power to devices that support it.
The Qi standard demands that all the hardware used in wireless charging must be backward compatible. The result is that any Qi pad is compatible with all Qi-enabled devices.