The TC2D Oxygen Fuel Cells are the power source for HydraCell Shark Flashlight and Aqua Pro Flashlight. TC2D HydraCells can be stored sealed, prior to first use, for 25+ years. They are activated to full capacity by simply dipping in water for 15 seconds. Once activated the cells will operate continuously under load, requiring only periodic re-hydration. At the end of the useful lifetime of the cells, they can be easily replaced.

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