There is no one who doubts about the potential of fast charging, since many users today come to it to have their mobile ready in a matter of even 15 minutes , as is the case of the 120W of the Xiaomi 11T Pro. However , there are many negative conceptions about it and the possible damage it can cause to the battery.
Manufacturers are constantly working on the goal of offering faster and faster speeds. Only two brands refrain from this fight and they are two of the industry giants such as Samsung and Apple, who maintain a standard number on their smartphones so as not to damage the autonomy of the device in the long term. In this sense, there are those who wonder if the fast charge, like the battery and other components, deteriorates over time. Here we offer the answer to your question.

Intact fast charge
Before delving into the core of the issue, it is interesting to note that current mobiles offer different degrees of compatibility with this feature. This means that the manufacturer is the one who decides the fast charge that each phone will support and from here there is a fundamental element that comes into play and that provides the necessary energy.

We are talking about the charger, since it is the fundamental part of this property. So with any adapter you will not take advantage of the potential of this functionality. However, it is possible that, even using the original with the maximum compatible voltage, the charging speed will be drastically reduced, although this has nothing to do with the loss or deterioration of the function.
If you are noticing how the fast charging of your mobile is not as efficient as at the beginning, it is quite likely that, for some reason, the charger has suffered internal damage that generates that greater slowness. This also applies to the cable, since, if one or the other is in poor condition, not only will it complete the charge slowly, but it can also be harmful to the battery and autonomy of the device.
Other related problems
Therefore, it is clear that a smartphone may not lose its ability to fast charge, but the charger or cable may experience failure or damage that results in slower charging. Likewise, it is necessary to point out that these are not the only two inconveniences that we will find on our way, since there are other factors that also affect the effectiveness of this particularity, such as:

- Use an adapter with less capacity.
- Damaged USB port of charger or damaged or dirty phone.
- Terminal software failure.
- Factory defect.
- USB debugging enabled.
These are some of the cases that can cause the fast charging of the mobile not to work correctly, although you should know that all is not lost. There are several ways to save both the battery and fast charging and some of the most common solutions are to calibrate the battery inside.
To do this you have to let it run out completely and wait half an hour. Once this period is over, put it to charge with the original charger and let it reach 100% . It is a simple method and it works many times, so we encourage you to try it. Otherwise, you can refer to the above link to learn more about fast charging, problems and solutions.