Emergency Charge Car Battery in Seconds, Nothing but original dead battery needed. Our bus battery.

I've been working on our homeschool's bus. Here in Indonesia, it is common to paint over the problems both figuratively and literally. So I've been working on our battery. If possible, I'd like to save it. It costs more than I'd like to spend to replace it. I bought a charger and have been trying to repair the battery with a repair setting. It is slow progress. However, I saw a YouTube short (can't find it now) that show a mechanic throwing a dead car battery across his shop floor. He said the jolt of the throw moved the sulfate crystals on the battery's lead plates, reducing the resistance and increasing the charge. Well, there's no way I am going to throw my battery that hard...I don't want to chance breaking it. So I decided to a more gentler approach and dropped it multiple times from an inch or less. Within seconds, my batter increased in charge. I tested it multiple times, and found this method to work. However, the charge would only last a few minutes, as seen in the video. But I believe this method is good for an emergency start.