Thermal photovoltaic cells.
http://jxcrystals.com/drupal/thermopv
Really good stuff here in PDF format, lots of color photos showing the hand held battery charger idea.
http://jxcrystals.com/publications/Fraa ... 202011.pdf
Midnight Sun jxcrystals
Midnight Sun jxcrystals
http://www.woodgaz-stove.com/
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