I looked at that same stove and decided it's not worth the effort -- they claim 2W sustained power, which is a bit less than a standard 500mA USB computer port

I looked at that same stove and decided it's not worth the effort -- they claim 2W sustained power, which is a bit less than a standard 500mA USB computer port can provide. At that rate, it would take hours to charge a phone, and I don't want to tend a fire for hours. So instead I bring along a 5000MaH battery pack (weight is around 5 ounces), and a 15W folding solar panel that generates enough power to charge even on overcast days (though certainly much less than 15W). (the solar panel is not light, it's around 1.5lbs)