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Wireless charging of the smartphone damages the battery

Wireless charging of the smartphone damages the battery

Experiments have shown that wireless charging of cell phones is detrimental to the life of the built-in cell phone batteries. In many cases, it is also not worth replacing the battery, because on the one hand this cannot be done by the owner on most models and it is often a very expensive thing after the warranty has expired. As a result, a new smartphone has to be produced – which is then usually charged again by induction.

In experiments, researchers find that wireless charging of smartphones damages the battery through excessive heat. If the cell phone is not exactly on the wireless charger, this is even more harmful for the cell phone. However, as attempts by the University of Warwick in England now show, this technique also has disadvantages.

For a few years now, the major cell phone manufacturers such as Appel, HTC, Huawei or Samsung have been fighting the cables. For example, the jack plug for the headphones has already been removed in many cell phone models and even those who want to charge their smartphone no longer have to use the cable for many devices. With the help of so-called charging pads, cell phones and other devices such as headphones or smart watches can be charged wirelessly.

Charge the cell phone battery correctly:

If you want to charge your cell phone battery correctly and want to increase the durability of your battery, you should note a few points:

  • Charge the cell phone only with the supplied cable and the original power plug.
  • Prevent the battery from over-discharging.
  • Ideally, the battery level of the cell phone battery is 65 – 75 percent. A battery level of 25 – 75 percent is more practical.
  • Do not charge the phone overnight.
  • Avoid the multitasking function of the device.
  • Avoid heat.
  • New technologies for wireless charging stations

Practical and comfortable matter:

Many manufacturers know that the current technology is not yet fully developed and are therefore already developing new wireless charging stations. Thinner charging coils as well as higher frequencies and the optimization of the electronics should soon solve today’s problems of charging pads.

More heat development and higher energy consumption:

According to the researchers, the main problem is the increased heat build-up of the cell phone battery when it is charged by an induction charger. Both the smartphone and the wireless charger emit heat when charging, which is also transferred from one device to the other. If the cell phone is not exactly aligned with the wireless charger, the heat development also increases significantly, since in this case the wireless charger increases its energy output.

Experiments have shown that charging the cell phone battery for three hours with a charging cable leads to heat development that does not exceed 27 degrees Celsius. When charging via wireless charger, temperatures of over 30 degrees Celsius were measured. If the smartphone was also wrong on the charging station, the temperature value was reached much faster.

High temperatures cause batteries, not only in cell phones, to age faster or lose their real capacity, which is why the researchers also assume that the batteries have a negative effect. The researchers also reported that if the smartphone was positioned incorrectly on the wireless charger, the charger’s energy output rose from 9.5 watts to 11 watts.

Wireless charger test: why wireless charging?

There are three main reasons for inductive charging. First: more comfort . The smartphone can be removed from the charging cradle without removing the plug. After use, it lands there again so that the cell phone battery remains full. Second: the aesthetics . Correctly placed, a charging station reduces the cable mess; the wire to the socket can disappear behind furniture, for example. Furnishings with loading space are even more elegant. For example, Ikea offers lamps with a charging cradle.

The Ikea installation set “Nordmärke” (price: 20 euros) can even be sunk into furniture using a drill attachment (hole drill). Third: more flexibility, For charging by cable, smartphones work with different sockets such as micro USB, USB-C or Lightning (Apple). In contrast, inductive charging works across all manufacturers using the Qi standard.

Wireless charger test: faster with a cable?

But what is actually better when every minute counts: with or without a cable? Because even when charging with wire, the cell phone manufacturers push the gas. Samsung includes a 15 watt power supply for its Galaxy S10 Plus, Huawei for its P30 Proeven one with 40 watts. Current iPhones can be charged with 30 watts – even if only a 5-watt charger is included (exceptions: iPhone 11 Pro and iPhone 11 Pro Max). Induction charging stations cannot keep up with that. Thanks to fast charging, the tested wireless devices have caught up significantly with the pace, but are not yet as fixed. Only the iPhone could be charged wirelessly faster than with the included power adapter. This is mainly due to the lame Apple adapter. With a suitable USB-C power supply such as the Anker PowerPort III mini (plus USB-C cable for the iPhone for a total of 40 euros), the iPhone also charged faster by cable.

Wireless charger test: not just turbochargers

Despite the uniform standard, the charging cradle is not the same as the charging cradle : the test showed huge differences in speed . And depending on the cell phone, one is at the front, sometimes the other. The Samsung Wireless Charger Duo Pad EP-P5200 fully charges the Galaxy S10 Plus in just two hours and 47 minutes, almost one and a half hours faster than the lame charger in the test.

On the iPhone XS Max, on the other hand, the Samsung charger doesn’t spill glory, as it takes almost five hours to fully charge! The Belkin Boost Up Bold did better: With three hours and 34 minutes, it not only put the fastest iPhone charge on the floor, but also pumped the Galaxy S10 Plus briskly (two hours and 54 minutes). The Anker PowerWave 7.5 Pad and the Mophie Charge Stream Pad Plus also performed well on both cell phone models.

Wireless charger test: wattage is important

The main reason for these differences in speed are the different wattage levels at which the device quickly charge . For example, the iPhone XS Max requires exactly 7.5 watts for this, many Android phones, on the other hand, 10 watts. If a charging station does not have a corresponding mode, the battery is only filled with a leisurely 5 watts. So before buying a charging station, smartphone owners must check which wattage their device needs and which wattage the charging cradle offers. If the two go together, nothing stands in the way of rapid electricity refueling.


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