Engadget Logo Engajet Japanese version of smartphone battery deterioration is due to wireless charging?The reason why Magsafe is safer than the points to note and Qi

Just the other day, I was worried about the battery status of my iPhone 12 mini, which I bought on the release date and used it for almost 10 months.

Even though I haven't used it for a year, the maximum capacity has decreased by more than 10%!My older sister's iPhone 11, which I used for almost two years, was 86%, and my mother's iPhone XS, which I used for almost three years, was 84%, so 89%without using it for a year is quite fast.。

When I thought about the difference in how to use it with my sister and mother, I thought that the clause I came up with was a lot of wireless charging.So this time I will explore the relationship between wireless charging and battery deterioration.

Wireless charging is easier to generate heat than wired charging

As mentioned in the previous article, the battery deterioration of the smartphone has a great effect on heat and charging rate.Therefore, fever when it is close to full charge can cause the battery greatly deteriorate.

Generally, wireless charging tends to generally generate heat than wired charging.This is because the wireless charging is to convert electricity to magnetism and then return it to electricity, which is inefficient to convey the energy of the entire system.Because the energy loss is released as a heat, wireless charging is easier to generate heat than wired charging.

In addition, if the position where the smartphone is placed on the wireless charger is slightly shifted, the energy propagation efficiency will be reduced, and the adjustment of frequency and output will be adjusted, making it easier to generate heat.

In past studies, it has been pointed out that the time it takes to cool after full charge is more than doubled in the case of wireless charging.From this result, it suggests that the battery is more likely to deteriorate when the heat generated when fully charged is fully charged.

Magsafe has solved the problem of fever due to a positional displacement

As an aside from here, Apple's Magsafe, OPPO's Magvooc, and RealMe Magdart, etc., are optimized to optimize the coil positions, so that the heat generation problem due to the broken broken is good. doing.

The Apple genuine Magsafe charger also has a function to control the charging speed according to the heat generation status, so you can use wireless charging with relatively confidence.

On the other hand, the AirPower, which has been discontinued, can be wirelessly charged everywhere, has a structure in which many coils are placed inside, but it is easy to generate heat because it causes a little shift.It is expected.

In addition, AirPower is designed so that multiple units can be charged, and it can be imagined that development was quite difficult due to problems such as magnetic interference.

Summary of points to be aware of when using wireless charging

I used an IKEA wireless charger, but even if it is fully charged, it is a specification that continues to be charged gradually, so it maintains a warm state (about 40 ° C?) Than body temperature.I understand that I have continued.We expect that this was one of the causes of battery deterioration because it was often left on a wireless charger overnight.

The point is how to use a wireless charger.

for that reason,

It is better to pay attention to such points.