So how does it work?

Water-powered battery consists of two electrodes made of special alloys, which, when immersed in water, produce electricity through a chemical reaction.

Simply refill the battery as the water evaporates - typically every 2 to 3 months. The battery has a minimum continuous life of 2 years.

Sorry, but this product has been discontinued.

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Hydro Power Calculator:

  • A real calculator, powered by water
  • Just fill the "batteries" with tap water, and you're ready to go
  • Very neat, eco-friendly and educational
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