You might want to stay away from videos like that that preach snake oil being the end all be all solution. There's no science behind it and you're introducing a battery into a freezer...? Clearly it's a crap video uploaded to garner some attention(since bad publicity is still publicity and YT thrives on engagements). In fact, the video production looks like it was put together with content cropped/snipped from other people's content.
As state above by my colleague, there's nothing to it. If your laptop's battery is being funky, replace it with a genuine part not the one's found off of Aliexpress with half hearted info slapped across them.