Many mobile phones now use the built-in or external charging coil to realize the wireless charging function. The Lumia series has had this design since the Lumia 920, but the new generation Lumia 925 has removed this function and replaced it with a wireless charging back cover, which may make the Lumia 925 easier to control in thickness and weight.

To enable Lumia 925 to support wireless charging, a special wireless charging back cover for Lumia 925 and a universal wireless charging board for Nokia Lumia series (other phones that support Qi's wireless charging standard can also use it) ▼

Qi wireless charging standard ▼

First, let's take a look at the special wireless charging rear cover of Lumia 925. There is a protective film ▼

There are two multi language instructions ▼

Metal contact ▼ can be clearly seen on the back of the protective shell

Close up of metal contact ▼

Effect after installing Lumia 925 ▼

About 2.7 mm ▼ thick after installation

The camera can be better protected after the back cover is put on ▼

Weight is 26g ▼

Nokia's wireless charging board, equipped with transformers, connecting cables and related instructions ▼

The charging board is fashionable and simple in design ▼

On the back of the charging board, it can be seen that the output current is 1A, which is the same as that of ordinary mobile phone chargers. In addition, there is another bright spot... ▼

Transformer parameter ▼

Put the phone on the charging board to start wireless charging. It takes about two hours from 20% to 100%, and the charging speed is acceptable ▼

The temperature is not too high when charging. The charging board and the back of the phone are both around 37 ℃ (room temperature 25 ℃) ▼