On April 3, 2011 (March 1, 2011), scientists invented the "water" battery. On April 3, 2011, scientists invented the "water" battery. Researchers at Stanford University recently invented a "water" battery, which can generate electricity using the difference in salinity between fresh water and sea water. This invention opens a new path for the development and utilization of new energy. Researchers explain that the principle of this battery is simple and its negative poles are immersed in the liquid containing ions (sodium ions and chlorine ions). When the battery is generated, fresh water is injected into the battery, charged with a small current, and then dry water is replaced by sea water, because the sea water contains electrons are 60 to 100 times the fresh water, which actually increases the pressure between the negative and the negative