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OWI Salt Water Fuel Cell Giant Arachnoid Kit

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Looking for an alternative fuel source for your little robot friends? Tired of having to constantly replace their old batteries and then having to deal with the hassle of disposing of the old ones? Fret no longer, now that you can be the proud owner of OWI’s Salt Water Fuel Cell Arachnoid Kit. This little eight-legged automaton will scurry along for hours powered by nothing more than a thin strip of magnesium and a few drops of salt water.

So, how does it work? Well, it turns out that air + magnesium + salt water = electricity. By placing the magnesium strip (the anode) under a porous carbon sheet (the cathode) and submerging the entire thing in salt water (the electrolyte), you allow the transfer of electrons from… you know what? It doesn’t really matter all that much. The point is, this is a great kit for your budding robotics evil genius to explore novel, alternative means of power generation while terrifying the arachniphobes in your household. It may also make a great teaching tool for some basic chemistry, if you’re up to doing the research on it.

Fully assembled, the arachnoid measures just shy of 4.5 inches. The kit includes three magnesium sheets, each of which will power the robot for around 5 hours of continuous use. As an added bonus, at around $1 per replacement magnesium sheet, the cost of powering this robot is much cheaper, and less wasteful, than normal alkaline batteries.

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