Myths and truths about fast charging. Is it really harmful to your mobile battery?

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1707490052 840 560.jpeg

There are currently mobile phones on the market that include chargers of up to 120 W, and there is fear that this type of ultra-fast charging could affect the health of the battery.


Nowadays we see mobile phones on the market with cameras with 200 Megapixel sensors almost 7-inch screens and refresh rates of 165Hzin addition to processors with impressive performance. But a section of the hardware that seems to have been left behind on mobile phones it’s the battery.

I say “it seems” because, in reality, it is not like that. Although the capacity of the batteries seems to have reached a peak of 6,000 mAh, with an average of between 4,000 mAh and 5,000 mAh for most mobile phones, in this case size (or rather capacity) is not everything. Current cell phones manage battery consumption much better and, on the other hand, charging is faster than ever.

This last aspect, however, is shrouded in myths: does fast charging harm the health of the battery? The quick answer is: no… although it is not that simple.

Fast charging does not ruin your mobile battery, but…

It’s been a long time since cell phones had 5W or 15W chargers in the box (in fact, many cell phones no longer include any charger in the box, but that’s another topic). For some years now we have expected a mobile phone to have support for fast charging of at least 20 W. And if it’s faster, the better.

In addition, we have devices with ultra-fast charging up to 120Was is the case of Xiaomi 13T Pro. The Asian company claims that this allows the battery to be charged from 0 to 100% in less than 19 minutes, a ridiculously fast (and surprising) speed. And there are even faster ones, like the Realme GT 3 Neo with its 240 W fast charging.

The problem with fast charging lies in the biggest enemy of a battery’s life and health: heat. Excessive heat damages cell phone batteriescausing them to suffer a greater normal wear. That is why it is never advisable to leave your phone directly under the sun for a long time (have you noticed how it gets hotter than normal when you use it on the beach?), much less if it is charging.


Taking into account that heat is the enemy to combat, and that ultra-fast charging can produce more heat, manufacturers have designed mobile phones and chargers that better manage temperature, both during charging and during use. That is why mobile phones include systems like steam chambers to help dissipate excess temperature. But with fast charging, it’s better to take precautions.

Experts recommend using fast charging only in specific cases, such as charging your phone quickly before leaving home.

Technically, both the mobile phone and the charger are designed to allow this charging speed, but even so, experts recommend that we use fast charging only in cases that are really necessary. For example: Do you have very low battery and you have to leave the house in a few minutes? Are you in a coffee shop and need to charge your phone for a short time before continuing with your day? In situations like this, it is advisable to use the fast charger.

What is not advisable is to leave your phone charging all night using fast charging.. In these cases, it is best to use a slower charger, 15 W or even 5 W. It will take much longer to charge, but it doesn’t matter, you will be sleeping. And of course, it is advisable to activate optimized loading.

According to the manufacturers, mobile phones with these charging capacities are designed so that even using fast charging, the battery life remains at least 80% after 800 charge cycles or more. However, it is wise to take their claims with a grain of salt and while fast charging is not harmful, With great power comes great responsibility so let’s use fast charging wisely.

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Mubashir Hassan
Expert in tech and gaming, blending industry insights with expertise