Kinds of cellphone battery technology

A few days ago the cell phone I was using suddenly couldn't charge. When I plug the charger cable into the power point, the charging indicator in the form of a percentage of the battery content does not increase but instead decreases. I saw that the phone I was using a removable battery which can be seen whether the battery is still good or damaged. After I checked the battery, it turned out that there were bubbles that were felt when I touched it.

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From this simple analysis, I decided to use a universal charger that can charge the batteries of various types of phones. When I charged it, it turned out that my previous analysis was not proven. I previously analyzed that the battery was broken, it turned out that I used a universal charger that could still charge it. From this, I conclude that the problem is probably the cellphone charging system. To check the correctness of this second analysis I tried to charge it with another charger, it didn't work and it made my second analysis more convincing, namely, there was a problem with the cellphone charging system.

With the problems I experienced earlier, I can take a lesson that for the problem of charging cellphones, I am personally more comfortable using cellphones with a battery system that can be removed. I imagine if the cellphone I use uses a non-removable battery system then I have to take the cellphone to a service place which will likely take longer. But on the other hand, the use of a non-removable battery system definitely has its own advantages, for example, we don't need to turn off the cellphone to remove the SIM card and SD card and this will save time and is much more practical than a cellphone with a removable battery system.