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I know this threads about /diy/ burners but I was thinking of the fuel that's used. Yellow bottle Heet (methanol) can be used in a fuel cell to charge batteries. This device for example from Japan weights a little over 1/2 a pound and can give a cell phone a full charge with only 1/4 an ounce of methanol. I'm sure with a little /diy/ Macgyvery they can be made to charge anything with a battery. I'm wondering why these things aren't more popular, and where can I get an ultra light one?