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Sept. 15, 2014 / 10:19 AM

Water-powered emergency battery charges cell phones

The water-powered Mg Box by Furukawa Battery generates electricity from magnesium to charge smartphones in emergency situations.

TOKYO, Sept. 15 (UPI) -- A Japanese company said its water-powered emergency battery generates enough juice to charge a smartphone up to 30 times.

Furukawa Battery announced the Mg Box, pronounced Mug Box, generates electricity for about five days once about 2 quarts of water are poured in and react with the magnesium inside.

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The company said the magnesium-air battery, designed as an emergency preparedness item, generates about 300Wh, enough electricity for up to five days.

The box will go on sale in mid-December for about $93, the company said.

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