First of all, you need to remember the first time you encountered this problem. If your laptop has this feature since you bought it, it is most likely an option enabled by the manufacturers of the model. This is done in order to extend the life of the factory battery. With this process (when the battery is not fully charged), it will last much longer.
Sometimes the battery is fully charged and stops charging at some point. If this happens, you can try restarting the battery. What should you do then? First of all, what you need to do is completely unload the device. Then you will need to plug in the charger and charge the battery for 9 hours. There is no one hundred percent guarantee that you will get a full result. If after such an operation you still find that it did not help you, you can use utilities and third-party programs again. It is also possible that something went wrong in your laptop settings and you have set a new maximum load threshold other than 100%.
Of course, laptop batteries have a lifespan, like all spare parts for these devices do. But when you are faced with a problem when the battery is not fully charged, don't blame the battery. You don't need to think that the battery is done. The first thing to do in a situation when the laptop does not start at all is to check the reliability of its connection to the power grid. In other words, check the power supply and whether the charger is properly connected on both sides or not, at the same time to the power supply and to the laptop itself. It's possible that the cable isn’t completely connected to the outlet, and that's precisely the cause of the problem. The situation gets worse if all of the above has been done correctly, but the laptop still won't turn on or charge.
In this case, the next step is to check the power supply. If it got burned, this would perfectly explain that the device is not working properly. It is possible that a voltage drop in the electrical network or technical wear of this part is the cause of its failure.