In this video, I will show you how to use old batteries to decompose water into hydrogen and oxygen or generate HHO gas. In this video, I separate the water molecules, which are hydrogen and oxygen, by electrolyzing water, and use the produced gas.

Note that you can also use potassium hydroxide powder or drain cleaner or salt to conduct water. But if you use salt, the color of the water will turn green or brown due to the production of hydroxide ions. Also, the efficiency of the drain cleaner solution is higher.