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Comment: And where does the energy contained in batteries come from? — “Energy transformation is when energy changes from one form to another – like in a hydroelectric dam that transforms the kinetic energy of water into electrical energy. While energy can be transferred or transformed, the total amount of energy does not change – this is called energy conservation”. — But there is a catch. The efficiency of any transformation of energy is always less than 100%. The rest is lost in the process as heat, accompanying chemical reactions, friction, noise, radiation, etc. This means that you have to put more energy in during the charging than you are getting out of a charged battery. Do these morons know that?