The Fact of Wireless Charging: Good Or Bad for Smartphone Batteries?

In 2019, most people can't live without a smartphone. It’s no doubt that few things are more anxious than watching phone’s battery slowly drain, and worrying about if the battery will make it through the day. This anxiety will only disappear when the battery is recharged.

wireless charger

Even though it is satisfied to see our battery at 100 percent, the idea of carrying a power bank or plug & charging cable all the time is really a burden for us. So, we can only endure the pain of drain in daily life.

But with Wireless Charging, the battery will no longer be a problem for us. Either through technology within the phone or a wireless charging supported phone case, you just simply leave your phone on a wireless charger and watch the battery meter rise. No additional attachment required!

Now the fastest wireless charging speed is up to 20W, much faster than Apple 7.5W wired charging.

[ Further reading: How does Xiaomi beat 99% of Wireless Charger in the world !]



How dose wireless charging work?


Actually, wireless charging has been invented for almost 200 years. In the 19th century, the famous genius Nikola Tesla found that electricity can be transmitted through the air in a magnetic field.

However, this technology has not been widely used in the last 100 years. Because they need to build a coil with a diameter of several meters to achieve wireless charging.

But in the year of 2006, scientists in MIT invented a new wireless charging technology – resonance charging, it was able to transmit a large amount of power without radiation over a few meters. This proved to be better for commercial need, and it was a major step for inductive charging.

Wireless Charging normally uses an electromagnetic field to transfer energy from charger to your device.

This video explains how electromagnetic induction works.


Now there are basically 3 different types of wireless charging.

Radio Charging

    • This is the first generation of wireless charging technology and barely be used for now. It transfers energy through radio waves. The device receiver needs to be the same frequency as the radio transmitter, this type of wireless charging only suits for a device with low power consumption.

    Inductive Charging

      • Induction chargers use a coil to create an electromagnetic field and another coil in the portable device to receiver energy from the electromagnetic field. Then convert the energy into electric current to charge your battery. With this technology, you just simply put your phone on the wireless charger when you need charging. It really improves your life quality with convenience.

      Resonance Charging

        • Resonance is the newest wireless charging technology, it can output a significant amount of power for your car, computer, etc.
        • Wireless charger and device each have one copper coil. When both coils work at the same electromagnetic frequency, the device can receive energy from the charger. This type of wireless charging supports Greater distances between sender and receiver coils. It’s also the most efficient way to convert energy, and charging speed is up to 20W now, faster than most wired charging.

         With the development of 5G, more and more smart devices can be connected with the Internet. Can you image you need to charge your smartphone, watch, earbuds, glasses separately? That would be very inconvenient. But with one single wireless charging pad, you can solve all charging problems. Sounds great, right?

        There are many companies are devoted to wireless charging industry now. Such as 8Blue, they provide many amazing wireless chargers for Apple, Android, and Car. You always can find one suits for you.



        Is wireless charging bad for my smartphone?


        Wireless Charging technology has been invented for almost 200 years, many people still worrying about it will damage our phone’s battery. Generally speaking, wireless charging charges your smartphone as same as the wired charging.

        Wireless charger uses a coil to create a magnetic field, then the receiver coil in your phone will generate current by transmitting the magnetic energy to electric energy. If you don’t worry about plugging in your phone several times a day by wired cable, then there is no necessary you need to worry about leaving your phone on a wireless charger.

        As more and more mobile phone manufacturers use wireless charging technology on their flagship models, this technology will become more and more popular in our daily life, which will greatly enhance the quality-of-life.

         In most cases, wireless charger means more freedom. For example, not only remove messy cables from your desk, but also let you charge your phone without any additional attachments.



        Is it bad to keep my smartphone fully charged all the time?


        There is a little “disadvantage” of wireless charging, that your phone may keep fully charged all the time. It's really very useful for our daily life, but will it damage my smartphone battery?

        Some people believe that wireless charging would shorten the lifespan of the smartphone’s battery. Is it true?

        First, it is possible that charge phone all the time will hasten the decline of the battery. The Expert Matt Reynolds said:

        Charging your phone so it stays at 100 percent overnight isn’t great news for the battery, but that’s not because you’re cramming in more charge than it can handle.
        A ‘trickle charge’ mechanism cuts off the charger after the phone has reached 100 percent charge, and only tops up the battery when it drops down a little. 
        The problem is that you’re keeping the charge level at 100 percent which, as we know from the previous myth, puts the battery under a certain amount of strain.”

        According to expert, Kent Griffith from the University of Cambridge, the phone battery manufacturers have already added BMS technology in the battery prevent the harm from constantly charging. Without the BMS system, constantly overcharging your phone will kill the battery in a few months. Let alone smartphone system built-in app prevents our phone from being overcharged.

        Keeping your smartphone “topped off” all the time may not be “good”, but it wouldn’t damage your battery.

        However, according to industry research, battery lifetime actually increases by four times when the depth of discharge – or the amount that the battery is drained – is limited to 50%, rather than 100%.

        Menno Treffers, chairman of the Wireless Power Consortium, “In other words, by continually topping off the phone battery during the day, as you might do with wireless charging, and not letting your phone battery dip below 50%, you will actually increase the lifespan of your battery.”

        Between the convenience of wireless charging and battery life, I would choose the convenience. Regardless of charging habits, batteries are consumable and should be replaceable.

        It’s pretty easy to change a phone battery or have someone do it for you for around 20$ (for iPhone is a little bit more. If you have an AppleCare extended warranty, then it's free).An extra $20 for a few years of convenience? That’s your call.


        The Best way to charge your smartphone


        There are many factors that can affect the battery’s lifespan, like:

        • Keep smartphone battery at 55-65% will get the most life out of your battery.
        • Battery drain to below 50% will decline its lifespan.
        • Some Apps keep running in the background will have more damage than any other factors.
        • Battery life will decrease at high temperatures or in the sun

         In conclusion, following these tips will extend your battery life.

        • It’s really bad that leave your smartphone charging in the sun
        • Shut down apps that run in the background for no reason
        • It’s better for your phone’s battery charged between 50 to 80 percent
        • Leaving your smartphone on wireless charger won’t damage the battery. It might extend its lifespan

        If you haven't owned a wireless charger yet, you can click here to see the best wireless charger for your smartphone.

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