How wireless charging affects the battery robinsdale time to understand: can I use wireless charging for the iPhone? Or indeed because of this, the battery goes down faster?

Thanks re:Store for useful information.

How does wireless charging?

Most smartphones with wireless charging, provide it in accordance with the international standard Qi (pronounced “Chi”).

In accordance with him, for power transfer from the charger to the smartphone, be it Samsung or iPhone, used 2 flat wire coil.

One of them is the base and is connected to the power source (the power supply connected to the AC socket 220V), and the second is inside the charging device is the receiver.

In the process of initial detection is the result of a change in capacitance or resonance coil of the transmitter.

Enough to make a smartphone with the appropriate Qi coil under the cover to the charging base, how to start the process of energy transfer — battery charging.

To control the charging process to start or stop it in time. For this Qi-Qi base and receiver are able to share system information.

Once an object has been detected, the base station checks whether it namely a Qi-compatible device, and transmits the data. If it sends a response signal, charging starts.

During charging of Qi-the device sends the data packets to adjust the power level and, finally, stop charging when the mobile device is fully charged.

I read that wireless charging is harmful. Is this true?

Last year author edition ZDNet announced terrible news: wireless charging and leads to premature wear of the battery of the iPhone.

The message was immediately disseminated by the media with terrifying headlines: “Wireless charging kills battery iPhone, iPhone Battery will be enough for six months!”.

Fortunately, the author meant something quite different.

Apple guarantees that your battery after 500 charges lose no more than 20% of the initial capacity, and it will happen not earlier than in 2 years.

Using a conventional battery charger, the user reaches this figure, after more than 800 charges or 2-3 years. And wireless — within 18 months.

But why is this happening?

Why charging heated?

To properly answer this question you need to rephrase the question: why wireless charging is less efficient than wired?

The answer is simple. Enough to remember school course of physics.

When passing current through the wire, the efficiency is quite high, if you use quality wire. With it, a large part of the current reaches the smartphone. The heat dissipation in the environment is minimal.

With wireless charging, a significant portion of the energy is dissipated and converted into heat in the heating elements and charging the smartphone.

Does this mean that wireless charging can not be used?

The connection of the heating and lifespan of the battery

Does it affect the battery life iPhone? Of course. But not so much to abandon a convenient way to keep the gadget always with full battery.

On the other hand, endless charge:

probably wasting charge cycles;

makes the battery constantly, though slightly, feel warm.

Such conditions are stressful for any LiPo-elements. Yes that there — for all batteries constant heat harmful.

The passage of current in electromagnetic induction prevent metal elements — for example, plate for car magnetic holder or case, covered with silver paint (silver paint based on aluminium powder).

The same can behave in a smartphone case-battery with a thick case or metal case.

All of this can not only lead to complete failure of the charge to further heating of the case.

Wireless or wired? Which is faster?

In fact, the main drawback of wireless chargers may be the value of the Qi standard provides the option of low power from 0 to 5W and an average power up to 10 watts.

For comparison, a conventional charger for iPhone has a capacity of 10 watts. Quick charge — 15 to 18 watts. Charger “head” OnePlus does provides 40 watts. And slow charging is healthier for the battery.

Especially if you use the right accessories. The maximum power consumption of iPhone with wireless charging, does not exceed 7.5 W — doesn’t make sense anymore.

A couple of smartphones at the same time not charge.

In addition, all the wireless charging built on the same coils that provide 5V/1A. To pass the smartphone more power with the producers inserted 2 or more coils.

The condition “more power = more heat” it is true. Moreover, if the charging base will emit a higher power — it will be more warm. But the smartphone will pick up only the necessary energy.

To reel in the smartphone, and, accordingly, the smartphone does not overheat, gadgets use “smart” algorithms that modify the capacity of the charging current depending on battery temperature.

Therefore, even if the same power wired and wireless charging recharge using Qi will be longer: the self heating of the battery will be added to the heating coil.

And this is without the low-power Qi chargers for iPhone in comparison with wire and self-heating of the smartphone.

Known issues with wireless charging

Because wireless charging creates a strong electromagnetic field, there may be problems with wireless networks, and some smartphones are starting to fail.

For example, poor quality ribbon cable to the screen can cause interference on the display, similar damage to the soldering of the dynamics to the noises in the audio.

Defective wireless charging can “make noise” — to emit a high-frequency sound, which is accompanied by induction.

As the charging needs to send regulatory packages, poor quality models can serve an increased or decreased current. In addition, it is possible to overcharge the battery.

This insured only the iPhone with a built-in, native wireless charging, as iPhone 8 and iPhone X limit the charge level to 80% while heating the battery.

But not before. A sharp jump in voltage might put the smartphone down, if the temperature rises abruptly.

If iPhone is connected the Lightning cable to a USB port on your computer or network adapter, it will charge via cable, but wireless charging will not be used.

Rules for the use of wireless charging

How to extend the battery life of iPhone when using wireless charging?

Just follow a few simple rules. Exactly the same as using a regular, wired charging. Quality accessory cable to the power supply — the main guarantee of security.

Other rules are not as binding. In the end, the degradation of the battery by 20%, in fact hardly noticeable. Yes and change the smartphones we not less than once in 2 years.

If these figures are frightening, enough to remove the smartphone from charging after recharge battery to 80% and, in principle, do not store it on the charger.

To use while charging power-intensive applications, especially 3D games or navigation programs that cause the CPU to work at maximum frequency, is not worth it. This leads to overheating.

Simply obeying rules will make using your iPhone much nicer and more reliable.


1. Wireless charging affects the battery the same as the others. The difference to notice is almost impossible.

2. Fast charging, wired and wireless, faster than normal displays battery failure.

3. A permanent connection to the charger is harmful because it consumes the reserve.

4. Run heavy apps while charging can cause serious overheating.

5. With wireless charging, dangerous surges in the network is even more dangerous. It is desirable to connect them to the stabilizing device.

6. The main harm comes from poor quality chargers and cables.

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