Wireless chargers. We love 'em. We have quite a few to choose from at Solid Signal. Wireless charging is now available on all high-end phones. We jumped on the bandwagon early as you can see from this 2010 video.
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Wireless charging uses a process called induction which transfers power over short distances using targeted radio broadcasting technology. This is a basic explanation, but it works well enough for this article. Wireless chargers that use Qi are the most popular. They can be used with many devices.
"Feeling hot, hot, hot"
No, I'm not talking about the inexplicable staying power of this video. The way your phone feels after you remove it from the wireless charger is what I am referring to. Many people have noticed that the area where the phone touches its charger feels extremely warm. It's almost to the point where people worry.
It wasn't that long ago that Samsung phones literally burst into flames. There are many YouTube videos showing people claiming their phones caught fire. Like any YouTube video (except for ours of course) these should be taken with a grain of salt.
However, wireless charging can cause phones to heat up. This is a problem?
Hot phones: Why?
Inefficiency is almost always the cause of heat. Engines heat up because they are unable to convert all of the energy from exploding gasoline into motion. People heat up because they cannot efficiently metabolize sugar when exercising and friction from movement. This is also true for charging phones. The battery's inefficiency in absorbing and storing power means that phones heat up when they are charging.
Wireless charging is by its very nature inefficient. The conductivity of electricity in air is not as good as that of wires. There will be heat. It could also be the battery. The charging pad's energy is expressed as heat and not usable power.
However, should you be concerned?
According to the Qi consortium, heat is not a concern in any of the cases they have tested. I'd go one step further. They have not tested every case and phone. Some cases are thicker which results in less energy transfer. Some cases are made of man-made materials that are more susceptible to melting under extreme heat. It's unlikely, however, to be an issue.
Are there any things you can do?
I have tested many wireless charging devices and always check for scorch marks or melting plastic after long charging sessions. I will be truthful and say that I have never seen one. There's always the chance that you might. If you have a large case, it is best to keep the standard charging speed. If you have an Otterbox-sized case, I wouldn't recommend using a Fast Charger. It could be superstition, but you need to be careful if you try to run twice as much current through a thick case.
Wireless charging and heat are not something I worry about. If it gets too hot, the phone will shut down automatically to prevent it from being damaged. It should also be turned off when it becomes dangerous. It's still a good idea for your phone to be monitored and to keep flammable items away from it. This is just common sense.
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