Get over your assumptions; wireless charging does not spare your smartphone’s battery. On the contrary, it reduces it. That is undoubtedly what researchers from the American Chemical Society have demonstrated in a new study.

According to a study by Morning Consult (November 2018), autonomy is the number one choice criterion for consumers when buying their smartphone. The product’s lifespan comes in third place. For most users, the latest technologies that some call “gadgets” (facial recognition, fingerprint reader, wireless charging, etc.) have almost no impact on the balance. However, the directions taken by the manufacturers go against the grain.

A study by researchers at the American Chemical Society found that wireless charging reduces the lifespan of smartphone batteries. In other words, a “gadget” function has an impact on two essential criteria (autonomy and sustainability).

How to save your battery

To avoid damaging the batteries, researchers give some practical advice. First, try to recharge the smartphone in a room where the temperature remains appropriate. When recharging, avoid launching applications that are too energy-intensive. Finally, remove the protective cover even if the accessory manufacturer ensures compatibility with wireless charging. Finally, make sure that the smartphone is perfectly positioned on the station.

Wired charging is more reliable

According to the ACS study, the problem with wireless charging is temperature management. For optimal charging, the smartphone and charger must be perfectly aligned. However, positioning the smartphone precisely on the base is difficult. It causes an increase in temperature during charging and reduces battery life.

Temperature can, therefore, have a significant influence on the health (SoH) of batteries and their life span. – ACS Study –

To support their point, the researchers compared the charging cycles of smartphones connected by wire and others on wireless stations. They indicate that to keep a battery healthy for as long as possible, the temperature during charging should be between 15 and 40°C. The lower it is, the more the battery is saved.

The study results show that with wired chargers, the temperature never exceeds 27°C. With a wireless charging system and a smartphone well positioned on the station, the temperature rises to 30.5°C and then drops in the second part of the recharge. On the other hand, if not perfectly aligned, this 30.5°C peak is maintained for nearly 70 minutes.

While these figures are not alarming, they do show that wireless charging damages the battery more than wired charging. The study does not specify whether rapid charging has been the subject of specific research. Reverse wireless charging is also not included in the results of this research.