There are several technologies for transmitting electricity through the air, including lasers, sound waves, and others. interesting ways. But so far only one can be called commercial - the use of electromagnetic induction, through which Faraday and Tesla tried to transmit energy. The most common inductive charging standard today has been developed by the Wireless Power Consortium for about seven years. This standard is called the Chinese word Qi - pronounced “chee” in English or “qi” in the Russian translation tradition. It is officially supported by almost all mobile phone manufacturers, starting with Samsung phones, Sony, Lumia, ending with small companies whose names mean nothing to anyone. Charging stations Some American airports, British McDonald's and Starbucks are promised to be equipped with this standard within a year, and this, as it becomes clear, is just the beginning of the list. This also includes new IKEA furniture and lamps with built-in charging panels - they will begin to be sold in Europe this month. Even Apple, which, as always, stands a little on the sidelines and does not officially support Qi, seems to still adhere to WPC principles in its watches.
How it works
Wireless charging using WPC technology involves the presence of induction coils in the phone and the charger: one acts as a receiver, the other as a transmitter of electricity. When the charger is connected to the mains, a voltage arises in it, and a magnetic field arises around its transmitter coil. When a phone enters this field, electromagnetic waves in its receiver coil are converted into electricity - the phone's battery begins to charge. The Qi standard implies that for complete energy transfer, the distance between devices should not exceed 3–5 centimeters. That is, they should practically touch each other. Therefore, most of the current induction chargers are small panels on which you need to place the phone. At the same time, their efficiency is about 75–80% - slightly less than that of wired chargers.
What are the pros and cons
If we talk about the average user, inductive charging has only one significant advantage. It eliminates the need to connect a cable to your phone (player, camera, watch and other small devices). And although it is called wireless, it does not actually remove the wire, since it is needed to connect the charging panel to the outlet. These panels also have other disadvantages: they are a little more expensive and on average charge one and a half to two times slower.
Is wireless charging dangerous?
This is probably the most popular question asked by the Wireless Power Consortium, and mobile manufacturers, of course, answer that it is safe. Manufacturers of electric shavers and electric toothbrushes are trying to convince everyone of this - the same induction principle has been used for a long time to recharge them. But it is worth keeping in mind that the electromagnetic waves through which wireless panels transmit energy belong to the spectrum of so-called non-ionizing (and therefore safe, unlike, say, X-ray) radiation. Electromagnetic waves of the same spectrum are used to transmit signals from radio stations, cell towers, and Wi-Fi routers. For example, a signal mobile phone is transmitted constantly and over much longer distances, but for its receiver to operate, only a small amount of power is required (within 1–2 watts). The maximum power of wireless panels of the Qi standard is significantly higher - 5 watts. But they (for now) work at extremely short distances, and they also turn off automatically (which means they stop emitting waves) if the device is charged.
In any case, there is convincing evidence that Qi wireless charging (as well as the signal cellular communication) can be a health hazard, no one has yet imagined. However, the Wireless Power Consortium is also working on more powerful wireless chargers (up to 120 watts) capable of charging laptops. But they are still being cautious with these devices, and no one seems to be releasing them.
Which devices support Qi wireless charging?
You can find out about this by searching on the WPC website. It is worth remembering that to carry out wireless charging you will need two things: a receiver and an energy transmitter. Some phones (and wearable devices) already have built-in charging modules, also known as receivers; all that remains to do with them is to select a wireless panel, also known as a transmitter. Other phones - all iPhones, for example - do not yet support this technology. In addition to the panel, you will also have to buy a special case or attachment with a charging module that connects to the smartphone via the usual charging connector.
Examples of wireless chargers
Samsung Wireless Charging Pad
PowerBot
Bestseller and, judging by reviews, the best wireless panel on Amazon. Compatible with Qi standard receivers. It comes with a micro-USB cable (which means it can be connected to a laptop or portable battery). Quite reliable and inexpensive model.
Perhaps the most exciting promise of recent years is a transmitter the size of a breadbox that allows you to charge phones, smart watch and bracelets, remote controls or gamepads at a distance of up to 10 meters. This is already to a greater extent wireless technology, freeing you from fiddling with the charger. It doesn’t matter whether the phone is on the table or in your pocket: as soon as it is discharged and is within range of the transmitter, it will begin to charge it. However, the device being charged must be equipped with a special Cota receiver. The developers promise to begin delivering these receivers to device manufacturers at the end of the year.
iQi Wireless Charging Receiver
Finally, an example of how things are going with wireless charging of Apple phones. Since iPhones do not yet support the technology, crutches come to the rescue in the form of cases, attachments and other accessories. For example, Duracell cases for $120, which Apple itself recommends in its store. But the most amazing device for the same purpose is the iQi receiver card, which is connected via the Lightning connector and hidden under a regular phone case. The project, which successfully raised funds on the crowdfunding platform Indiegogo, can now be found on Amazon (although it’s probably better to try to wait for the seventh or eighth iPhone: one or the other, according to rumors, will have its own built-in receiver for wireless charging).
High competition among smartphone manufacturers forces them to constantly look for and introduce new functions and technologies into their products that are not yet available or are not used by direct competitors for various reasons. If the technology turns out to be successful and wins the hearts and, most importantly, the wallets of consumers, then other manufacturers begin to use the successful solution found in their products over time. The ultimate beneficiary in this fight remains the consumer, who gets new features at an affordable price.
One of these technologies was the Qi wireless power standard (read as “Qi” in honor of the term in Eastern philosophy, implying an energy substance). This standard was developed by the Wireless Power Consortium (WPC) to transfer energy through inductive fields to short distances(up to 4 centimeters). It was first implemented by Nokia in the Lumia 920 model in 2012. Subsequently, other players in the smartphone market began to implement this technology in their products: Apple, Asus, HTC, Huawei, LG, Samsung, Sony and others.
Despite the seeming fantastic nature of the charging process itself for no reason, it is based on the well-known physical process of energy transfer through electromagnetic induction between the transmitter, which is played by Charger and a receiver, which will be a charging smartphone or any other device.
How to find out if your phone supports wireless charging?
Today, an increasing number of phones are being released with support for the wireless power standard. You can find out whether your phone has this capability in the following ways.
- The easiest way will be to decide on Apple products. Qi support has appeared in smartphones from this company starting with the iPhone 8. Earlier models do not have a built-in wireless charging function, but if desired, they can also be equipped with third-party accessories in the form of compact wireless charging, which can be easily hidden under the phone case.
- The owner of smartphones with operating Android system You'll have to spend a little more time figuring this out. Most The best way for them it is to carefully study the specifications specific device on the manufacturer’s website and try to find there a mention of the possibility of wireless charging.
- To those for whom previous method seems difficult due to various circumstances, we suggest looking for the model of your smartphone in the click-drop-down list below. It includes all phone models that have wireless charging functionality at the time of publication of this article.
- Asus PadFone S
- BlackBerry Passport
- BlackBerry PRIV
- BlackBerry Z30
- CASIO G"z One Commando
- Google Nexus 4
- Google Nexus 5
- Google Nexus 6
- HP Elite X3
- HTC Droid DNA
- HTC Windows Phone 8X
- Kyocera Brigadier
- Kyocera DuraForce
- Kyocera Hydro Elite
- Kyocera Torque G02
- Kyocera Torque KC-S701
- Kyocera Urbano L01
- Kyocera Urbano L03
- LG G2
- LG G3
- LG G6
- LG G6 Plus
- LG G7
- LG G7 ThinQ
- LG Lucid 2
- LG Lucid 3
- LG Optimus F5
- LG Optimus G Pro
- LG Optimus It L-05E
- LG Spectrum 2
- LG Vu 2
- LG Vu 3
- LG V30
- LG V30 Plus
- Microsoft Lumia 950
- Microsoft Lumia 950 Dual Sim
- Microsoft Lumia 950 XL
- Microsoft Lumia 950 XL Dual Sim
- Motorola Droid Maxx
- Motorola Droid Mini
- Motorola Droid Turbo
- Motorola Droid Turbo 2
- Motorola Moto Maxx
- Motorola Moto X Force
- Nokia Lumia 1520
- Nokia Lumia 735
- Nokia Lumia 830
- Nokia Lumia 920
- Nokia Lumia 928
- Nokia Lumia 929
- Nokia Lumia 930
- Nokia 8 Sirocco
- Panasonic Eluga P P-03E
- Panasonic Eluga V P-06D
- Panasonic Eluga X P-02E
- Philips X723
- Samsung Galaxy S6
- Samsung Galaxy S6 Active
- Samsung Galaxy S6 Edge
- Samsung Galaxy S6 Edge Plus
- Samsung Galaxy S7
- Samsung Galaxy S7 Active
- Samsung Galaxy S7 Edge
- Samsung Galaxy S8
- Samsung Galaxy S8 Active
- Samsung Galaxy S8 Plus
- Samsung Galaxy S9
- Samsung Galaxy S9 Plus
- Samsung Galaxy Note 8
- Samsung Galaxy Note 9
- Samsung Leader 8
- Samsung W2016
- Sony Xperia Z3V
- Sony Xperia Z4V
- Sony Xperia XZ2
- Sony Xperia XZ2 Premium
- Yotaphone 2
- ZTE Telstra Tough Max
- Asus PadFone S
Wireless chargers are one of the latest innovations in the technology market in recent years. For a long time, people have dreamed of being able to charge their phone without having to constantly search for an outlet and cord, but now it has finally become a reality. We present to your attention a rating in which we have collected the best wireless chargers for your phone, in case you wanted to get hold of such an accessory, but didn’t know which model to choose.
No. 10 – Samsung EP-PG920I
Price: 2,800 rubles
Our rating opens with the Samsung EP-PG920I. This model was dedicated to the release of the Samsung Galaxy S6 gadget, but it is also perfect for other smartphones. The accessory is equipped with a standard microUSB connector, so you can use it not only at home from the network, but also in the car or outdoors, if you happen to have a portable battery or laptop with a free USB connector nearby. Samsung EP-PG920I weighs 87.5 g. Input voltage is 5V, output current is 1000 mA, output voltage is 5 V.
Samsung EP-PG920I has an interesting and stylish design. Also, a nice feature is the glow of the accessory, depending on the operating mode. The principle of operation of the backlight is as follows: when charging, the device is illuminated in blue, and when it is finished, in green.
Samsung EP-PG920I
#9 – Nillkin Fast Wireless Charging
Price: 2,400 rubles
Nillkin Fast Wireless Charging supports fast charging technology, which will significantly reduce the time required for your smartphone to replenish energy. The accessory allows you to position the gadget both vertically and horizontally. It can be used with any smartphone that supports Qi wireless charging. The amount of input current is in the range of 5V-2A/9V-1.67A, output power is 5W/10W. Nillkin Fast Wireless Charging weighs 130 g. Externally, the device looks modern and stylish, so it will fit perfectly into any environment, be it an apartment, an office or even a car.
Nillkin Fast Wireless Charging
№8 – ROCK W8 QUICK WIRELESS CHARGER
Price: 1,500 rubles
ROCK W8 QUICK WIRELESS CHARGER is made in accordance with all modern standards accepted in the world of wireless chargers, so the owner can place his gadget in it, both vertically and horizontally.
ROCK W8 is equipped with a double induction coil, which provides the adapter with 10 V power. The device supports Quick Charge 2.0 and 3.0 wireless charging standards. The ROCK W8 QUICK WIRELESS CHARGER has a built-in metal object detection that will warn you if there is a foreign object on its surface that is interfering with the process. The electrical protection board will protect your smartphone from power surges.
ROCK W8 QUICK WIRELESS CHARGER
No. 7 – Belkin F8M747bt BOOST UP Qi 1A
Price: 4,300 rubles
In order to use the Belkin F8M747bt BOOST UP Qi 1A with a modern and interesting design, your smartphone must support Qi charging technology. To start the process, simply place the corresponding smartphone on the surface of the charger. Output voltage – 5 V, maximum output current – 1000 mA. The Belkin F8M747bt BOOST UP Qi 1A has no significant disadvantages, we can only note the lack of fast charging.
Belkin F8M747bt BOOST UP Qi 1A
No. 6 – Momax Q.PAD X Fast Wireless Charger (UD6W)
Price: 2,000 rubles
First of all, the Momax Q.PAD X Fast Wireless Charger (UD6W) surprises with its thinness of 8 mm, which, with a monolithic body, gives the accessory a presentable and interesting design. Owners of the latest ones will especially like this device. iPhone models, because when you use it, the lightning connector is freed up, thus making it possible to connect a headset and listen to music.
Momax Q.PAD X Fast Wireless Charger (UD6W) has an advanced protection system, which significantly reduces the chances that your smartphone will become a victim of voltage surges. The case is equipped with a special charging indicator, so you can always monitor how the process is progressing.
Momax Q.PAD X Fast Wireless Charger
No. 5 – Nillkin Magic Charger DISK 4
Price: 1,500 rubles
Nillkin Magic Charger DISK 4 is made of ABS plastic. There are no complaints about the build quality; the design looks reliable and inspires confidence. The charger is equipped with LED backlight, thanks to which you can always monitor the charging process. The device holds firmly on the surface, for which we must thank the special rubberized leg, which is located at the bottom.
Current and input voltage Nillkin Magic Charger DISK 4 – 5V / 2A, 9V / 1.7A. Fast Charge supported. On average, to fully charge your Samsung gadget, this accessory will take about 2 and a half hours. Quite a good indicator, which can also be attributed to the advantages of the model. Among the main disadvantages, we highlight the noise that appears during charging.
Nillkin Magic Charger DISK 4
No. 4 – Spigen Essential Fast Wireless Charger F303W
Price: 3,000 rubles
Spigen Essential Fast Wireless Charger F303W is a device with an interesting and modern design, which includes a rubberized coating and an LED indicator. The output power when charging is 5/9 W. Like most modern wireless chargers, Spigen Essential Fast Wireless Charger F303W provides for both horizontal and vertical placement of the smartphone.
The good news is that the model is equipped with protection against overheating and overcharging, so you don’t have to worry about your smartphone. In those cases, if your smartphone overheats, charging will stop and when the temperature returns to normal, the process will continue. Because of this, it is recommended to place the charger in as cool a place as possible.
Spigen Essential Fast Wireless Charger F303W
No. 3 – Samsung EP-PG950
Price: 5,000 rubles
Samsung EP-PG950 looks very attractive. The soft pad, which is located on the front, may at first glance seem to be made of leather, but upon closer examination it becomes clear that plastic was used as the material for its creation. By the way, it is quite easily soiled and gets dirty quickly.
Samsung EP-PG950 works best with smartphones Samsung, surprisingly. Yes, the device is considered universal and can be used with all other smartphones that support the Qi charging standard, however, for example, the iPhone 8 will reach 100% battery within 4 hours, while the Galaxy S8 will only need two and a half hours. And this despite the fact that the product from Samsung has a 1200 mAh larger battery.
Samsung EP-PG950
No. 2 – Xiaomi Wireless Charger
Price: 2,600 rubles
Xiaomi Wireless Charger was shown to the public in the spring of this year, along with Xiaomi Mi Mix 2S. Wireless charging in the device is carried out using the popular Qi standard. The accessory uses 5 W of power during normal charging; if fast charging takes place, this figure increases by 2.5 W. Like all modern devices, Xiaomi Wireless Charger has protection against overheating and power surges.
Like Xiaomi smartphones, the wireless charger features a practical and discreet design. The developers decided not to stray from their path even here, focusing on the technical component, and appearance kept it simple. However, there is still an LED indicator that allows you to track the charging process, and this is very cool.
Xiaomi Wireless Charger
No. 1 – Skyway Energy Fast
Price: 2,300 rubles
Skyway Energy Fast gets gold in our rating. I would immediately like to say about the two color schemes of the device. It can be made in black or have a dark wood design; in the first case, Skyway Energy Fast looks stylish, in the second it is unique and very unusual. Input voltage – 5V/2A, 9V/1.67A. The LED indicator is located on the bottom of the structure. It lights up when charging starts.
Protection against overheating and power surges also did not pass by Skyway Energy Fast. Although the corner design seems larger than the disk shape used in most other charger models, in fact it fits seamlessly into any workplace.
Skyway Energy Fast
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The increase in battery capacity in modern smartphones results in an increase in recharge time. To speed up the process, manufacturers are developing new technologies such as QuickCharge, VOOC or PumpExpress. However, all of them are only designed to reduce the time spent on charging, but do not present anything radically new. Another development path is wireless charging. This promising direction, although slowly, is developing.
The convenience of wireless charging lies in the fact that you do not need to get tangled in wires and aim the cable plug at a small connector. The speed still leaves much to be desired, but you can recharge your smartphone simply by placing it in close proximity to a special source electromagnetic radiation. Smartphones that support wireless charging and are relevant in 2016 will be discussed in the selection.
In February 2016, the company introduced a couple of new Galaxy flagships S7 and S7 Edge. Now they can be purchased at prices ranging from $550 and $600, respectively. Both smartphones feature high levels of performance, excellent cameras, and support for wireless charging. They can replenish the battery capacity through Qi standard pads (the more popular one). The PMA wireless standard is also supported. In general, the devices are balanced and good in everything.
- Screen: Super AMOLED matrix, resolution 2560x1440 pixels, flat 5.1" (S7) or curved 5.5" (S7 Edge)
- Processor and graphics: Samsung Exynos 8890, 8 cores + Mali T880 MP12 GPU, or Qualcomm Snapdragon 820, 4 cores + Adreno 530 GPU (depending on the market)
- Memory: 4 GB RAM, 32 or 64 GB permanent + MicroSD
- Camera: resolution 12 MP, size 1/2.5", pixel size 1.4 µm, aperture f/1.7, DualPixel full phase autofocus), flash, OIS (optical stabilization), 4k video recording, front - 5 MP, f /1.7
- Battery: 3000 mAh (S7), 3600 mAh (S7 Edge)
- OS: Android 6
The combination of advanced functionality and premium design makes these smartphones one of the best in 2016. By and large, they have nothing to complain about at all (except for the not very affordable price).
Samsung Galaxy S6 and S6 Edge – thin flagships
Despite the fact that the Samsung Galaxy S6 and S6 Edge were released last year, they remain relevant in 2016. Nowadays, you can purchase the devices from $400 or $500, respectively. In addition to the top-end hardware at the time of presentation (which is still not listed as an outsider), the smartphones received thin bodies. Both models support Qi (Qi) and PMA fast charging.
Samsung Galaxy S6 and S6 Edge are powerful and balanced smartphones that can now be bought for reasonable money. One of the disadvantages is the lack of a slot for a flash drive.
LG Nexus 5 – compact ex-flagship
3 years have passed since the release of LG Nexus 5, but it’s difficult to call it ancient. The smartphone remains relevant in 2016, although it can no longer compete with flagships. It has an excellent display and a good camera that can give some of the newer 13 and 16 MP models a run for their money. LG Nexus 5 supports Qi wireless charging. You can now find a smartphone starting at $160.
The smartphone is quite capable of competing with mid-budget devices in 2016 (and surpassing them). The disadvantages are the lack of a slot for a flash drive and a small battery.
Motorola Nexus 6 – phablet with a large screen and stereo sound
The large Google phone Motorola Nexus 6 came out 2 years ago, and in the fall of 2016 it looks like a strong middle peasant. A large high-resolution screen and a laconic design are the main advantages of the device. The smartphone supports wireless charging using the Qi standard. The price of the phablet at the time of compiling the selection is from $270.
- Display: AMOLED, 2560x1440, 5.96"
- Processor and graphics: Snapdragon 805, 4 cores + Adreno 420
- Memory: 3 GB RAM, 32/64 GB permanent
- Camera: 13 MP, 1/3", 1.4 µm, f/2, autofocus, flash, OIS, 4K video, front – 2 MP, F/2.2
- Battery: 3220 mAh
- OS: Android 5, update to version 7
Traditionally for Nexuses, the Motorola Nexus 6's main disadvantage is the lack of MicroSD. But the advantages of the Motorola Nexus 6 include stereo speakers on the front panel. 
LG G3 D855 – phablet with thin frames
Released in the summer of 2014, the LG G3 D855 is a flagship device at that time, or a mid-level device for the fall of 2016. Considering that you can now buy it for $180, its venerable age by mobile standards does not matter. Moreover, the device has thin frames (the screen occupies more than 75% of the front panel), and is also equipped with a dedicated DAC and a Qi wireless charging module.
- Display: IPS, 2560x1440 pixels, 5.5"
- Processor and graphics: Snapdragon 801, 4 cores + Adreno 330
- Memory: 2 or 3 GB RAM, 16 or 32 GB permanent + MicroSD
- Camera: 13 MP, 1/3", 1.12 µm, f/2.4, phase detection + laser autofocus, flash, optical stabilization, 4K video, front – 2 MP, f/2
- Battery: 3000 mAh
- OS: Android 4.4, update to version 6
Thanks to a large high-resolution screen, compact dimensions (for 5.5") and a good battery, the smartphone is still sold and has admirers. 
Microsoft Lumia 950 – the last of the Mohicans
In 2016, fans of the Windows Phone OS received sad news: Microsoft stopped producing Lumia series smartphones. The last flagship released based on this system at the end of 2015 was the Microsoft Lumia 950. The device received the top-end hardware at that time and a Qi wireless charging module. Now you can buy a Microsoft Lumia 950 by paying $350 or more.
- Screen: AMOLED, 2560x1440, 5.2"
- Processor and graphics: Qualcomm Snapdragon 808, 6 cores + Adreno 418
- Memory: 3 GB RAM, 32 GB storage + MicroSD
- Camera: 20 MP, 1/2.4", 1.12 µm, f/1.9 Carl Zeiss, autofocus, flash, OIS, 4K video recording, front – 5 MP, f/2.4
- Battery: 3000 mAh
- OS: Windows 10 (Phone)
Microsoft Lumia 950 is one of the best Microsoft smartphones during all this time. For fans operating system from MS, who do not want to part with it, this is the optimal device. 
Samsung Galaxy Note 5 – a thin phablet with a stylus
Released in the summer of 2015, the Samsung Galaxy Note 5, due to the unsuccessful release of its successor, in 2016 remains the last successful flagship in this line. The device is equipped with hardware that is still relevant today, a good camera, and also has a large ratio of front panel to display area (76%). It is equipped with wireless charging that works with the Qi standard. PMA wireless charging is also supported. You can buy a Samsung Galaxy Note 5 by paying from $570.
- Screen: Super AMOLED, 2560x1440 pixels, 5.7"
- Processor and graphics: Exynos 7420, 8 cores + Mali T760 MP8
- Memory: 4 GB RAM, 32/64/128 GB ROM
- Camera: 16 MP, 1/2.6", 1.12 µm, f/1.9, phase detection autofocus, flash, optical stabilization, 4K video, front – 5 MP, f/1.9
- Battery: 3000 mAh
- OS: Android 5.1 Android update 6
Among the advantages of the Samsung Galaxy Note 5 we can also note a dedicated DAC and a proprietary stylus, and the lack of a memory card slot can be noted as disadvantages. 
Other smartphones
Other smartphones that support wireless charging that are not included in our selection:*
- ZTE V975 Geek
- Nokia Lumia 930
- Nokia Lumia 920
- Nokia Lumia 925
- Nokia Lumia 1520
- Nokia Lumia 720
- Nokia Lumia 810
- Nokia Lumia 820
- Nokia Lumia 822
- Nokia Lumia 928
- Samsung Galaxy Note Edge
- Blackberry 9700
- Blackberry 9700
- Fujitsu F-03D
- Fujitsu F-09D
- HTC 8X
- HTC Droid DNA
- HTC Droid Incredible 2
- HTC Droid Incredible 4G
- HTC Rezound
- HTC Thunderbolt
- LG Optimus G Pro
- LG Spectrum
- LG-Google Nexus 4
- LG Lucid 2
- LG Optimus F5
- Motorola Droid Bionic
- Motorola Droid 4
- Motorola Droid 3
- NEC N-01D
- NEC N-04E
- Panasonic P-02E
- Panasonic P-06D
- Pilips Xenium
- Sharp SH-02D
- Sharp SH-04D
- Sharp SH-04E
- Sharp SH-05D
- Sharp SH-07D
- Sharp SH-09D
- Sharp SH-13C
- Sharp SH-13C
- Sony Xperia Z
*in fact, there are more smartphones that support wireless charging, and some of the list only support separately connected pads with an over-the-air charge receiver. Find out about the smartphone you are interested in in the comments to this article. You can also expand this list by writing your smartphone model in the comments.
There are special adapters that you can purchase and install yourself under the cover of your smartphone, and the device will support wireless charging. They are connected via contacts for the NFC antenna. You can see what it looks like in the video after the list of smartphones that support similar adapters:
- Samsung Galaxy S3
- Samsung Galaxy S4
- Samsung Galaxy S5
- Samsung Galaxy Note 2
- Samsung Galaxy Note 3
- Samsung Galaxy Note 4
There are similar adapters for the iPhone, but they are connected via a connector and have a small cable so that the cover with the charge receiver can be folded and attached to the back cover. However, the practicality of such a design is questionable. 
In addition to similar devices, on the Chinese market you can find adapter cases for iPhones with the ability to charge a smartphone wirelessly, but in this case you will have to sacrifice thickness.
There are options, like the Jiayu G6 smartphone, which has an open adapter connector on the back cover. However, to use wireless storage, you will need to purchase an original smartphone case. 
Wireless charging technology already existed several years before the release of the first mobile devices with its support, but it was with the release of the Nokia Lumia 920 and Lumia 820 mobile phones this technology began to become widespread.
More and more smartphones are receiving wireless charging technology, especially flagship models. All you need to charge these devices is to put them down back cover on a special panel. No wires needed. There is no need to press any buttons. Charging starts and ends automatically.
Why do you need wireless charging?
In addition to the fact that wireless charging is convenient in itself, its use allows you to extend the life of the power connector. In addition, such a device may be the only normal way to charge a smartphone if its connector is already broken. One of the disadvantages of the technology is a slightly longer charging process.
How does wireless charging work?
The principle of this technology is based on the action of a magnetic field. The smartphone acts as a receiver of this field, and the wireless charging itself - the panel where the device is placed - acts as a transmitter. The transmitter and receiver are a so-called magnetic coil. The diagram below demonstrates the basic method of transmitting electricity through a magnetic field.
The magnetic field is generated by the transmitter coil located on the charging panel, and the receiver coil located in the smartphone receives it, converts it into electricity and thus charges the battery.
How to properly charge your smartphone using wireless charging?
Typically, wireless charging is not included with mobile devices; it must be purchased separately. Therefore, first of all, when purchasing such a charger, you need to make sure that it is suitable for specific model. All modern smartphones with the wireless charging function they use the international Qi standard, which means the charger you buy must also be marked accordingly.
It is important to position your smartphone correctly during wireless charging. It must be placed on the panel as indicated in the device instructions. There should be no foreign objects between the cover and the smartphone battery. Moreover, if your smartphone has an additional removable panel installed, you do not need to remove it for wireless charging: the induction range is 1 centimeter.
Only one device can be charged per wireless charging pad. To charge two or more models, there are special panels with two built-in magnetic field transmitters.
There is a rumor that you cannot use your smartphone while wireless charging. This is wrong. In this case, there are no restrictions on the use of mobile phones.
How do you know if your smartphone supports wireless charging?
Very simple. Firstly, support for such a function is stated in the instructions for the device. Another way to check whether a smartphone supports air charging is to look at the inside of its cover: if the cover has several contacts in the area where the battery is located, then this technology is supported. This is what these contacts look like on the cover of the Lumia 820:
Telecoil cover next to the regular Lumia 820 cover:
Your iPhone doesn't support wireless charging, but would you like it to have this feature? No problem. You can now add wireless charging at absolutely any time. mobile device with a microUSB connector (as well as iPhones and Samsungs with their universal connectors). In this case, in addition to purchasing the wireless charging panel itself, you need to buy a wireless coil receiver:
The receiver is placed under the cover of the device and connected to the power port. In online stores it is sold for 300 - 500 rubles, depending on the power. The higher the power, the faster the charging will be.
The aesthetics of the smartphone in the case of such an upgrade, as can be seen in the photo, will suffer in a certain way, but those who know how to use a soldering iron, instead of directly connecting the receiver to the microUSB port, can solder the receiver directly to the inside of the device. Instructions on how to add wireless charging to your smartphone can be found on the Internet.
