Regarding "giant storage batteries":<br><br>On the east coast of the US, there is actually a method of storing energy from wind-farms for later use. It involves using the excess power from a wind farm to pump water from a low-altitude lake into a lake at a higher altitude.<br><br>When the power is needed, the flow is reversed and rerouted through a hydroelectric generator.,(reply>), ! That's cool! Smart!,(reply>), @Guess I'm Chrissy :  Yes, it is.<br><br>From Wikipedia:<br>"A battery is a device consisting of one or more electrochemical cells with external connections for powering electrical devices such as flashlights, mobile phones, and electric cars....When a battery is connected to an external electric load, a redox reaction converts high-energy reactants to lower-energy products, and the free-energy difference is delivered to the external circuit as electrical energy.",(reply>), @Captain Quirk nope. thats an electrolytic battery.,(reply>), @fghsgh :  Yes.  That's what a battery <b><i>is.</i></b>,(reply>), @Captain Quirk Did anyone specify that a battery must use redox chemistry for its function?