A complete teardown and analysis of the Blackout Buddy H2O water powered flashlight. This is an emergency flashlight intended to have a very long shelf life, but activate when water is added.
Although this technology is often described as “water powered” in similar products, the water is merely rehydrating the dry electrolyte in a multi-call battery and as soon as it is added the battery electrodes start to change state as in normal cells. That means that after activation the battery will have a short active life before being depleted completely. In this case all the energy created is used to illuminate three LEDs taped in parallel across the two sides of the cell stack. Brightness will vary widely in use until gradually fading away.
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