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Gizmos like these aren't "water-powered". There's a battery in there. A common galvanic cell consisting of two types of metals. But this cell is incomplete, you have to fill it up yourself with an electrolyte (namely, water). Compared to the power consumption of a calculator and to the batteries that are usually used it's quite bulky, though eventually, the materials of this cell are used up, and the electrochemical reaction will cease. No matter how much water you refill, because that's not the power source.
The selling point isn't that it's is a scientific miracle (it's 200-year-old technology), or that it's something that makes more sense than a cheap, simple, lightweight solar cell that runs without the extra work of filling it up. What is sold here is simply some instant sense of achievement for the easily astonished. (no offense :) )
A calculator-powered calculator! :D