How are smartphone batteries charged wirelessly

Smartphones: Tips and tricks for wireless charging with Qi technology

The Qi standard allows a smartphone to be charged wirelessly.
Screenshot: Wireless charging is a practical matter. You just put the phone on the charging mat and the electricity starts flowing. Annoying fiddling with plugs is no longer necessary. If you want to charge your smartphone by induction, you should currently only buy chargers or accessories that work according to the Qi standard (pronounced "Tschi"). Powermat products that work according to the PMA standard cannot charge current smartphones with induction charging, writes the magazine "CHIP" (issue 3/2015).

Nevertheless, PMA chargers are occasionally also offered online by mail order. Buying them, but not worth it. Compatible smartphones are currently not available due to different frequencies, so a bulky plug-in adapter is required for charging.

Qi charges more slowly than a USB power adapter

The Qi standard allows a smartphone to be charged wirelessly.
Screenshot: Users of induction chargers also need to know that it takes significantly longer to fully charge the battery compared to a charging cable. So far, the power of Qi devices has been set to a maximum of five watts. In practice, this leads to around 60 percent longer loading times. However, if you charge your smartphone overnight, you will hardly notice it. If, on the other hand, things have to go quickly, the power supply with the help of the USB charging cable comes into consideration. The lower charging current also has a positive effect on the service life of the battery, since the components of the battery are exposed to less stress during the charging process. Wireless charging also has advantages in other respects: The mechanical wear and tear on the USB socket of the smartphone is significantly reduced - and the awkward fiddling with the micro-USB plug is also an end.

In order to get the most out of the wireless Qi technology, the smartphone must be positioned exactly over the charging coil of the charger. This is not always easy, especially with third-party products - especially since it is not always possible to see where the receiving coils are located on the smartphone from the outside. A look at the manual can therefore do no harm to ensure that the smartphone is correctly placed on the Qi charging station.

Manufacturer accessories are not mandatory

Manufacturers often offer special charging stations for their Qi smartphones, but these are not always particularly cheap. But they then fix the mobile phone in the optimal charging position with the help of a magnetic device or some other holding device.

There are currently eleven smartphone models on the market that support wireless charging from home. These include Google's Nexus models, some Lumias from Microsoft and the LG G3. Many other telephones can be upgraded with the ability to charge wirelessly using a clip-on cover. Anyone who retrofits does not necessarily have to use original accessories. Third-party devices that work according to the Qi standard also work reliably.

You can find out how to extend the life of your smartphone battery in our guide to optimal battery care for lithium-ion batteries.