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This Flashlight is Powered by Water, Urine, Soda, Whatever Really

But is it a good flashlight?

As a matter of policy, I automatically pass on any flashlights that can’t be charged over USB or solar at this point, but I had to make an exception for one that runs on water.

Dip Hydralight’s fuel cell in water for 7-10 seconds and it runs for 100 hours. That’s it. No batteries, no cables, no cradles. The magic stands on its own, which is good because the presentation leaves a lot to be desired.

The Hydralight is a very ugly, very plastic, very big, and not very powerful flashlight. It doesn’t have any intensity or beam settings, alternate modes, emergency signals, additional tools, or plasma lighters to accompany it, and you’ll be paying shipping even if you order on Amazon.


When things go (even more) south, a puddle of dirty water (or urine) is going to be a lot easier to find than batteries, a micro-USB cable, fuel, electricity, or matches, so we certainly don’t begrudge Hydralight a place in our bug out bag. For everything else from fixing your sink to glamping, use a flashlight you love.

Editor Emeritus, The Inventory

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