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King Fruit not only have a delicious taste. But, this fruit also can make a waste that can be contaminated the environment. And, many people always handle it with making them as a compost. Here, I am using the experiment to search something important for this fruit. It’s known that actually King Fruit seeds contain 43,7 gram-46,2 gram carbohydrate every 100 gram King Fruit seed that can be converted into glucose. That mean, this fruit can be made as bio-ethanol as a new energy. And this type of ethanol can be used for the mixing of avtur. The fuel of aero plane. Before we get the ethanol, we should fermented it for about 3-4 days. We used Saccharomyces cerevisiae yeast for helping the fermentation. The same thing happens on King Fruit skin. This skin can be used as a substitute of battery. Because, this King Fruit skin contains high potassium as well. As a comparison, it can be compare with the normal battery that have energy 1,5 volt. This kind of king fruit skin have electycity energy as big as 1,25 volt.