Battery doesn't fall from 99%

[polila6]

Hello, I've been using almost for a hole day my laptot. The battery performance is good but the problem is that my laptot (MSI prestige 15) always indicates that I have a 99% battery always, no matter for how long I use it. I will try to drain the battery until the laptot switches off but I don't know what could be happening. I have also to say that I have already tried to unistall and install the battery drivers from the device manager on my laptot.

Thanks