I have the second-hand Dell Latitude E5430 laptop. The battery (60Wh capacity) works about 2h (playing the movie from the pendrive). The charging time is 2-3h. The operating system (Windows 10 x64) shows the systematic decrease of battery energy from 100% to 30-35% (when the laptop works). Next, the battery indicator rapidly jumps to 7%. Is it possible to correct or calibrate the battery indicator?