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.
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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