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This is one but looks at nature electric power generation cup light. By the fact that acid and the zinc chemical reaction produce electric current,this principle designs this cup light,copper,post and zinc post split the bottom one inserting in glass or the bottle .but that battery has been ready for the hit by copper post is that the battery positivepole,zinc post it is negative pole to inlay in glass to pouring into acidity liguid in the cup or within the bottle filament inside the be therefore likely give out light.
Xuefei Liu and Di Fang
Ziyan Wu Liyuan Chen Xinyue Hu