New Japanese battery only needs water to power up smartphones in a disaster

Sitting on several fault lines, Japan is no stranger to natural disasters and the havoc that ensues afterward. While these tragedies can’t be prevented, their effects can be lessened by making a disaster preparedness kit to handle several days without power or access to food and water.

A key item in these kits is usually batteries, and a Japanese company’s recent announcement about a new kind of battery is expected to completely change the way we prepare for disasters. Only needing to be filled with water, the “Mg Box” battery can be used to charge smartphones, and the invention has made the Japanese company’s stock skyrocket as investors rush to back the game-changing technology.

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