​Will Using A Wireless Charger for A Long Time Damage The Battery?

Will using a wireless charger for a long time damage the battery?

With the continuous advancement of technology and people's demand for convenience, various household devices have begun to support wireless charging, which can be said to have become completely popular and prevalent. While some people love wireless charging, others question it. Will using a wireless charger for a long time damage the battery? Is it true that the so-called wireless fast charging on the Internet will shorten battery life? Let's answer these questions today.

First, the conclusion: There is no difference in the impact on the battery.

Let’s elaborate. The principle of wireless charging is actually very simple. Many people are familiar with the phenomenon of "electromagnetic induction"—when an electric current passes through a coil, it generates a magnetic field. The wireless charging device transmits energy to the charging terminal device, which then converts the received energy into electrical energy stored in the device's battery. This is the principle used by current wireless chargers.

So, will the magnetic field generated by wireless charging damage the battery of electronic devices? The answer is no. Smartphones that support wireless charging have a coil on their back to receive and collect magnetic field energy. The electromagnetic induction of wireless charging can only affect the coil on the phone's back.

If the principles are too complex and difficult to understand, let’s use a practical case to explain. Take the test mobile phone used by Golden Eagle engineers as an example: after using a wireless charger for charging over the past six months, the measured battery degradation was approximately 3.8%. In comparison, under the same usage frequency, using a wired charger for charging resulted in a battery degradation of approximately 3.9%. Therefore, whether charging via wired or wireless methods, the battery degradation of the phone is almost the same.

If you encounter the situation where a wireless charger allegedly damages the battery, you can suspect the following possibilities:

1. Whether your wireless charger is unqualified, as only unqualified chargers are more likely to cause battery degradation issues.

2. Incorrect charging habits. Most smart electronic products use lithium batteries, and lithium ions have a certain level of activity. Excessive discharge will definitely affect battery life.