Look at me, the Chuwi support people provided me with a program to measure the performance of the battery. I sent them a screen of the program as soon as the computer had been turned on after several hours being off and fully charged (and it was less than 80% of its capacity). And they answered me to do it again, but after putting the battery info program to play, it plays 4 hours of video, which is what the battery has to last. So the answer was not adequate, they are not understanding my problem I think, and they confuse it with a poor performance of the battery in the switched on computer and that is not the problem. I am sending you the link of the program so that you can use it and look at it.
And look at the result of my analysis in the image.